diff --git a/docs/extras/modules/chains/how_to/custom_chain.ipynb b/docs/extras/modules/chains/how_to/custom_chain.ipynb
index 0c305a3cd42..9034e005966 100644
--- a/docs/extras/modules/chains/how_to/custom_chain.ipynb
+++ b/docs/extras/modules/chains/how_to/custom_chain.ipynb
@@ -28,7 +28,7 @@
     "\n",
     "from pydantic import Extra\n",
     "\n",
-    "from langchain.base_language import BaseLanguageModel\n",
+    "from langchain.schemea import BaseLanguageModel\n",
     "from langchain.callbacks.manager import (\n",
     "    AsyncCallbackManagerForChainRun,\n",
     "    CallbackManagerForChainRun,\n",
diff --git a/langchain/agents/agent.py b/langchain/agents/agent.py
index 63837514762..807101e074e 100644
--- a/langchain/agents/agent.py
+++ b/langchain/agents/agent.py
@@ -14,7 +14,6 @@ from pydantic import BaseModel, root_validator
 
 from langchain.agents.agent_types import AgentType
 from langchain.agents.tools import InvalidTool
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForChainRun,
@@ -35,6 +34,7 @@ from langchain.schema import (
     BasePromptTemplate,
     OutputParserException,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import BaseMessage
 from langchain.tools.base import BaseTool
 from langchain.utilities.asyncio import asyncio_timeout
diff --git a/langchain/agents/agent_toolkits/csv/base.py b/langchain/agents/agent_toolkits/csv/base.py
index dbda4be8baf..f13494bede4 100644
--- a/langchain/agents/agent_toolkits/csv/base.py
+++ b/langchain/agents/agent_toolkits/csv/base.py
@@ -3,7 +3,7 @@ from typing import Any, List, Optional, Union
 
 from langchain.agents.agent import AgentExecutor
 from langchain.agents.agent_toolkits.pandas.base import create_pandas_dataframe_agent
-from langchain.base_language import BaseLanguageModel
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def create_csv_agent(
diff --git a/langchain/agents/agent_toolkits/json/base.py b/langchain/agents/agent_toolkits/json/base.py
index 3a6f58e582e..67b977a6a42 100644
--- a/langchain/agents/agent_toolkits/json/base.py
+++ b/langchain/agents/agent_toolkits/json/base.py
@@ -6,9 +6,9 @@ from langchain.agents.agent_toolkits.json.prompt import JSON_PREFIX, JSON_SUFFIX
 from langchain.agents.agent_toolkits.json.toolkit import JsonToolkit
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.agents.mrkl.prompt import FORMAT_INSTRUCTIONS
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def create_json_agent(
diff --git a/langchain/agents/agent_toolkits/nla/tool.py b/langchain/agents/agent_toolkits/nla/tool.py
index 2e79b678561..00997764dcb 100644
--- a/langchain/agents/agent_toolkits/nla/tool.py
+++ b/langchain/agents/agent_toolkits/nla/tool.py
@@ -4,9 +4,9 @@
 from typing import Any, Optional
 
 from langchain.agents.tools import Tool
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.api.openapi.chain import OpenAPIEndpointChain
 from langchain.requests import Requests
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.openapi.utils.api_models import APIOperation
 from langchain.tools.openapi.utils.openapi_utils import OpenAPISpec
 
diff --git a/langchain/agents/agent_toolkits/nla/toolkit.py b/langchain/agents/agent_toolkits/nla/toolkit.py
index 42ac0113393..7415c399980 100644
--- a/langchain/agents/agent_toolkits/nla/toolkit.py
+++ b/langchain/agents/agent_toolkits/nla/toolkit.py
@@ -7,8 +7,8 @@ from pydantic import Field
 
 from langchain.agents.agent_toolkits.base import BaseToolkit
 from langchain.agents.agent_toolkits.nla.tool import NLATool
-from langchain.base_language import BaseLanguageModel
 from langchain.requests import Requests
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 from langchain.tools.openapi.utils.openapi_utils import OpenAPISpec
 from langchain.tools.plugin import AIPlugin
diff --git a/langchain/agents/agent_toolkits/openapi/base.py b/langchain/agents/agent_toolkits/openapi/base.py
index 60a7aaacc5b..bac17044273 100644
--- a/langchain/agents/agent_toolkits/openapi/base.py
+++ b/langchain/agents/agent_toolkits/openapi/base.py
@@ -9,9 +9,9 @@ from langchain.agents.agent_toolkits.openapi.prompt import (
 from langchain.agents.agent_toolkits.openapi.toolkit import OpenAPIToolkit
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.agents.mrkl.prompt import FORMAT_INSTRUCTIONS
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def create_openapi_agent(
diff --git a/langchain/agents/agent_toolkits/openapi/planner.py b/langchain/agents/agent_toolkits/openapi/planner.py
index 87cd01ab8d8..0e605221510 100644
--- a/langchain/agents/agent_toolkits/openapi/planner.py
+++ b/langchain/agents/agent_toolkits/openapi/planner.py
@@ -28,7 +28,6 @@ from langchain.agents.agent_toolkits.openapi.planner_prompt import (
 from langchain.agents.agent_toolkits.openapi.spec import ReducedOpenAPISpec
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.agents.tools import Tool
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
 from langchain.llms.openai import OpenAI
@@ -36,6 +35,7 @@ from langchain.memory import ReadOnlySharedMemory
 from langchain.prompts import PromptTemplate
 from langchain.requests import RequestsWrapper
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 from langchain.tools.requests.tool import BaseRequestsTool
 
diff --git a/langchain/agents/agent_toolkits/openapi/toolkit.py b/langchain/agents/agent_toolkits/openapi/toolkit.py
index 9c243cf72bf..e70c92d5385 100644
--- a/langchain/agents/agent_toolkits/openapi/toolkit.py
+++ b/langchain/agents/agent_toolkits/openapi/toolkit.py
@@ -9,8 +9,8 @@ from langchain.agents.agent_toolkits.json.base import create_json_agent
 from langchain.agents.agent_toolkits.json.toolkit import JsonToolkit
 from langchain.agents.agent_toolkits.openapi.prompt import DESCRIPTION
 from langchain.agents.tools import Tool
-from langchain.base_language import BaseLanguageModel
 from langchain.requests import TextRequestsWrapper
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools import BaseTool
 from langchain.tools.json.tool import JsonSpec
 from langchain.tools.requests.tool import (
diff --git a/langchain/agents/agent_toolkits/pandas/base.py b/langchain/agents/agent_toolkits/pandas/base.py
index 264b11ab519..fec09514d73 100644
--- a/langchain/agents/agent_toolkits/pandas/base.py
+++ b/langchain/agents/agent_toolkits/pandas/base.py
@@ -16,10 +16,10 @@ from langchain.agents.agent_toolkits.pandas.prompt import (
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.agents.openai_functions_agent.base import OpenAIFunctionsAgent
 from langchain.agents.types import AgentType
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import SystemMessage
 from langchain.tools.python.tool import PythonAstREPLTool
 
diff --git a/langchain/agents/agent_toolkits/powerbi/base.py b/langchain/agents/agent_toolkits/powerbi/base.py
index 62fed35c14b..2cb4a79c47e 100644
--- a/langchain/agents/agent_toolkits/powerbi/base.py
+++ b/langchain/agents/agent_toolkits/powerbi/base.py
@@ -9,9 +9,9 @@ from langchain.agents.agent_toolkits.powerbi.prompt import (
 from langchain.agents.agent_toolkits.powerbi.toolkit import PowerBIToolkit
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.agents.mrkl.prompt import FORMAT_INSTRUCTIONS
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.utilities.powerbi import PowerBIDataset
 
 
diff --git a/langchain/agents/agent_toolkits/powerbi/toolkit.py b/langchain/agents/agent_toolkits/powerbi/toolkit.py
index b5ceee2b5de..417dc361c21 100644
--- a/langchain/agents/agent_toolkits/powerbi/toolkit.py
+++ b/langchain/agents/agent_toolkits/powerbi/toolkit.py
@@ -4,7 +4,6 @@ from typing import List, Optional, Union
 from pydantic import Field
 
 from langchain.agents.agent_toolkits.base import BaseToolkit
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
 from langchain.chat_models.base import BaseChatModel
@@ -14,6 +13,7 @@ from langchain.prompts.chat import (
     HumanMessagePromptTemplate,
     SystemMessagePromptTemplate,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools import BaseTool
 from langchain.tools.powerbi.prompt import (
     QUESTION_TO_QUERY_BASE,
diff --git a/langchain/agents/agent_toolkits/python/base.py b/langchain/agents/agent_toolkits/python/base.py
index 0cb8d7bd6b5..c1263c84ec3 100644
--- a/langchain/agents/agent_toolkits/python/base.py
+++ b/langchain/agents/agent_toolkits/python/base.py
@@ -7,9 +7,9 @@ from langchain.agents.agent_toolkits.python.prompt import PREFIX
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.agents.openai_functions_agent.base import OpenAIFunctionsAgent
 from langchain.agents.types import AgentType
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import SystemMessage
 from langchain.tools.python.tool import PythonREPLTool
 
diff --git a/langchain/agents/agent_toolkits/spark_sql/base.py b/langchain/agents/agent_toolkits/spark_sql/base.py
index 3d4eb399907..b52352b5af3 100644
--- a/langchain/agents/agent_toolkits/spark_sql/base.py
+++ b/langchain/agents/agent_toolkits/spark_sql/base.py
@@ -6,9 +6,9 @@ from langchain.agents.agent_toolkits.spark_sql.prompt import SQL_PREFIX, SQL_SUF
 from langchain.agents.agent_toolkits.spark_sql.toolkit import SparkSQLToolkit
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.agents.mrkl.prompt import FORMAT_INSTRUCTIONS
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def create_spark_sql_agent(
diff --git a/langchain/agents/agent_toolkits/spark_sql/toolkit.py b/langchain/agents/agent_toolkits/spark_sql/toolkit.py
index 620f12f9325..7c89c7dc5f4 100644
--- a/langchain/agents/agent_toolkits/spark_sql/toolkit.py
+++ b/langchain/agents/agent_toolkits/spark_sql/toolkit.py
@@ -4,7 +4,7 @@ from typing import List
 from pydantic import Field
 
 from langchain.agents.agent_toolkits.base import BaseToolkit
-from langchain.base_language import BaseLanguageModel
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools import BaseTool
 from langchain.tools.spark_sql.tool import (
     InfoSparkSQLTool,
diff --git a/langchain/agents/agent_toolkits/sql/base.py b/langchain/agents/agent_toolkits/sql/base.py
index 790fecc985a..351f971175d 100644
--- a/langchain/agents/agent_toolkits/sql/base.py
+++ b/langchain/agents/agent_toolkits/sql/base.py
@@ -12,7 +12,6 @@ from langchain.agents.agent_types import AgentType
 from langchain.agents.mrkl.base import ZeroShotAgent
 from langchain.agents.mrkl.prompt import FORMAT_INSTRUCTIONS
 from langchain.agents.openai_functions_agent.base import OpenAIFunctionsAgent
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
 from langchain.prompts.chat import (
@@ -20,6 +19,7 @@ from langchain.prompts.chat import (
     HumanMessagePromptTemplate,
     MessagesPlaceholder,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import AIMessage, SystemMessage
 
 
diff --git a/langchain/agents/agent_toolkits/sql/toolkit.py b/langchain/agents/agent_toolkits/sql/toolkit.py
index 4a525252e1c..f9589a601e1 100644
--- a/langchain/agents/agent_toolkits/sql/toolkit.py
+++ b/langchain/agents/agent_toolkits/sql/toolkit.py
@@ -4,7 +4,7 @@ from typing import List
 from pydantic import Field
 
 from langchain.agents.agent_toolkits.base import BaseToolkit
-from langchain.base_language import BaseLanguageModel
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.sql_database import SQLDatabase
 from langchain.tools import BaseTool
 from langchain.tools.sql_database.tool import (
diff --git a/langchain/agents/agent_toolkits/vectorstore/base.py b/langchain/agents/agent_toolkits/vectorstore/base.py
index c3fd97e8d40..92f7e06e580 100644
--- a/langchain/agents/agent_toolkits/vectorstore/base.py
+++ b/langchain/agents/agent_toolkits/vectorstore/base.py
@@ -8,9 +8,9 @@ from langchain.agents.agent_toolkits.vectorstore.toolkit import (
     VectorStoreToolkit,
 )
 from langchain.agents.mrkl.base import ZeroShotAgent
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def create_vectorstore_agent(
diff --git a/langchain/agents/agent_toolkits/vectorstore/toolkit.py b/langchain/agents/agent_toolkits/vectorstore/toolkit.py
index 4169557028c..73289c8401d 100644
--- a/langchain/agents/agent_toolkits/vectorstore/toolkit.py
+++ b/langchain/agents/agent_toolkits/vectorstore/toolkit.py
@@ -4,8 +4,8 @@ from typing import List
 from pydantic import BaseModel, Field
 
 from langchain.agents.agent_toolkits.base import BaseToolkit
-from langchain.base_language import BaseLanguageModel
 from langchain.llms.openai import OpenAI
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools import BaseTool
 from langchain.tools.vectorstore.tool import (
     VectorStoreQATool,
diff --git a/langchain/agents/chat/base.py b/langchain/agents/chat/base.py
index 62415f9385c..3eb0cd26cfb 100644
--- a/langchain/agents/chat/base.py
+++ b/langchain/agents/chat/base.py
@@ -11,7 +11,6 @@ from langchain.agents.chat.prompt import (
     SYSTEM_MESSAGE_SUFFIX,
 )
 from langchain.agents.utils import validate_tools_single_input
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
 from langchain.prompts.chat import (
@@ -20,6 +19,7 @@ from langchain.prompts.chat import (
     SystemMessagePromptTemplate,
 )
 from langchain.schema import AgentAction, BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 
 
diff --git a/langchain/agents/conversational/base.py b/langchain/agents/conversational/base.py
index ce91d9c6b62..7fdffacd89e 100644
--- a/langchain/agents/conversational/base.py
+++ b/langchain/agents/conversational/base.py
@@ -10,10 +10,10 @@ from langchain.agents.agent_types import AgentType
 from langchain.agents.conversational.output_parser import ConvoOutputParser
 from langchain.agents.conversational.prompt import FORMAT_INSTRUCTIONS, PREFIX, SUFFIX
 from langchain.agents.utils import validate_tools_single_input
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains import LLMChain
 from langchain.prompts import PromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 
 
diff --git a/langchain/agents/conversational_chat/base.py b/langchain/agents/conversational_chat/base.py
index 8eb310b30fb..1ffb7ff1244 100644
--- a/langchain/agents/conversational_chat/base.py
+++ b/langchain/agents/conversational_chat/base.py
@@ -13,7 +13,6 @@ from langchain.agents.conversational_chat.prompt import (
     TEMPLATE_TOOL_RESPONSE,
 )
 from langchain.agents.utils import validate_tools_single_input
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains import LLMChain
 from langchain.prompts.chat import (
@@ -23,6 +22,7 @@ from langchain.prompts.chat import (
     SystemMessagePromptTemplate,
 )
 from langchain.schema import AgentAction, BaseOutputParser, BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import AIMessage, BaseMessage, HumanMessage
 from langchain.tools.base import BaseTool
 
diff --git a/langchain/agents/initialize.py b/langchain/agents/initialize.py
index 8b4ff608f70..dfbb7f9b47b 100644
--- a/langchain/agents/initialize.py
+++ b/langchain/agents/initialize.py
@@ -4,8 +4,8 @@ from typing import Any, Optional, Sequence
 from langchain.agents.agent import AgentExecutor
 from langchain.agents.agent_types import AgentType
 from langchain.agents.loading import AGENT_TO_CLASS, load_agent
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 
 
diff --git a/langchain/agents/load_tools.py b/langchain/agents/load_tools.py
index 2b7b08668d0..320d7d81a20 100644
--- a/langchain/agents/load_tools.py
+++ b/langchain/agents/load_tools.py
@@ -5,7 +5,7 @@ from typing import Any, Dict, List, Optional, Callable, Tuple
 from mypy_extensions import Arg, KwArg
 
 from langchain.agents.tools import Tool
-from langchain.base_language import BaseLanguageModel
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.callbacks.manager import Callbacks
 from langchain.chains.api import news_docs, open_meteo_docs, podcast_docs, tmdb_docs
diff --git a/langchain/agents/loading.py b/langchain/agents/loading.py
index 5e3a881725e..6447fea103d 100644
--- a/langchain/agents/loading.py
+++ b/langchain/agents/loading.py
@@ -9,8 +9,8 @@ import yaml
 from langchain.agents.agent import BaseMultiActionAgent, BaseSingleActionAgent
 from langchain.agents.tools import Tool
 from langchain.agents.types import AGENT_TO_CLASS
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.loading import load_chain, load_chain_from_config
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.utilities.loading import try_load_from_hub
 
 logger = logging.getLogger(__file__)
diff --git a/langchain/agents/mrkl/base.py b/langchain/agents/mrkl/base.py
index e1d55eb12f6..a3939cbeec8 100644
--- a/langchain/agents/mrkl/base.py
+++ b/langchain/agents/mrkl/base.py
@@ -11,10 +11,10 @@ from langchain.agents.mrkl.output_parser import MRKLOutputParser
 from langchain.agents.mrkl.prompt import FORMAT_INSTRUCTIONS, PREFIX, SUFFIX
 from langchain.agents.tools import Tool
 from langchain.agents.utils import validate_tools_single_input
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains import LLMChain
 from langchain.prompts import PromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 
 
diff --git a/langchain/agents/openai_functions_agent/base.py b/langchain/agents/openai_functions_agent/base.py
index 3e03297a5b6..fcd1ca50f6f 100644
--- a/langchain/agents/openai_functions_agent/base.py
+++ b/langchain/agents/openai_functions_agent/base.py
@@ -7,7 +7,6 @@ from typing import Any, List, Optional, Sequence, Tuple, Union
 from pydantic import root_validator
 
 from langchain.agents import BaseSingleActionAgent
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.callbacks.manager import Callbacks
 from langchain.chat_models.openai import ChatOpenAI
@@ -23,6 +22,7 @@ from langchain.schema import (
     BasePromptTemplate,
     OutputParserException,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import (
     AIMessage,
     BaseMessage,
diff --git a/langchain/agents/openai_functions_multi_agent/base.py b/langchain/agents/openai_functions_multi_agent/base.py
index 82c3712d256..8cf16d81222 100644
--- a/langchain/agents/openai_functions_multi_agent/base.py
+++ b/langchain/agents/openai_functions_multi_agent/base.py
@@ -7,7 +7,6 @@ from typing import Any, List, Optional, Sequence, Tuple, Union
 from pydantic import root_validator
 
 from langchain.agents import BaseMultiActionAgent
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.callbacks.manager import Callbacks
 from langchain.chat_models.openai import ChatOpenAI
@@ -23,6 +22,7 @@ from langchain.schema import (
     BasePromptTemplate,
     OutputParserException,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import (
     AIMessage,
     BaseMessage,
diff --git a/langchain/agents/react/base.py b/langchain/agents/react/base.py
index e7cbfb6466b..51bd1f2373d 100644
--- a/langchain/agents/react/base.py
+++ b/langchain/agents/react/base.py
@@ -10,10 +10,10 @@ from langchain.agents.react.textworld_prompt import TEXTWORLD_PROMPT
 from langchain.agents.react.wiki_prompt import WIKI_PROMPT
 from langchain.agents.tools import Tool
 from langchain.agents.utils import validate_tools_single_input
-from langchain.base_language import BaseLanguageModel
 from langchain.docstore.base import Docstore
 from langchain.docstore.document import Document
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 
 
diff --git a/langchain/agents/self_ask_with_search/base.py b/langchain/agents/self_ask_with_search/base.py
index 2ddff23a85e..47f5c04dbe8 100644
--- a/langchain/agents/self_ask_with_search/base.py
+++ b/langchain/agents/self_ask_with_search/base.py
@@ -9,8 +9,8 @@ from langchain.agents.self_ask_with_search.output_parser import SelfAskOutputPar
 from langchain.agents.self_ask_with_search.prompt import PROMPT
 from langchain.agents.tools import Tool
 from langchain.agents.utils import validate_tools_single_input
-from langchain.base_language import BaseLanguageModel
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 from langchain.utilities.google_serper import GoogleSerperAPIWrapper
 from langchain.utilities.serpapi import SerpAPIWrapper
diff --git a/langchain/agents/structured_chat/base.py b/langchain/agents/structured_chat/base.py
index 57514e63753..85c214e2919 100644
--- a/langchain/agents/structured_chat/base.py
+++ b/langchain/agents/structured_chat/base.py
@@ -8,7 +8,6 @@ from langchain.agents.structured_chat.output_parser import (
     StructuredChatOutputParserWithRetries,
 )
 from langchain.agents.structured_chat.prompt import FORMAT_INSTRUCTIONS, PREFIX, SUFFIX
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.chains.llm import LLMChain
 from langchain.prompts.chat import (
@@ -17,6 +16,7 @@ from langchain.prompts.chat import (
     SystemMessagePromptTemplate,
 )
 from langchain.schema import AgentAction, BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools import BaseTool
 
 HUMAN_MESSAGE_TEMPLATE = "{input}\n\n{agent_scratchpad}"
diff --git a/langchain/agents/structured_chat/output_parser.py b/langchain/agents/structured_chat/output_parser.py
index d53ae58c838..a59b814401d 100644
--- a/langchain/agents/structured_chat/output_parser.py
+++ b/langchain/agents/structured_chat/output_parser.py
@@ -9,9 +9,9 @@ from pydantic import Field
 
 from langchain.agents.agent import AgentOutputParser
 from langchain.agents.structured_chat.prompt import FORMAT_INSTRUCTIONS
-from langchain.base_language import BaseLanguageModel
 from langchain.output_parsers import OutputFixingParser
 from langchain.schema import AgentAction, AgentFinish, OutputParserException
+from langchain.schema.language_model import BaseLanguageModel
 
 logger = logging.getLogger(__name__)
 
diff --git a/langchain/base_language.py b/langchain/base_language.py
index 5e97366d6af..30323070e54 100644
--- a/langchain/base_language.py
+++ b/langchain/base_language.py
@@ -1,105 +1,6 @@
+"""Deprecated module for BaseLanguageModel class, kept for backwards compatibility."""
 from __future__ import annotations
 
-from abc import ABC, abstractmethod
-from typing import Any, List, Optional, Sequence, Set
+from langchain.schema.language_model import BaseLanguageModel
 
-from langchain.callbacks.manager import Callbacks
-from langchain.load.serializable import Serializable
-from langchain.schema import LLMResult, PromptValue
-from langchain.schema.messages import BaseMessage, get_buffer_string
-
-
-def _get_token_ids_default_method(text: str) -> List[int]:
-    """Encode the text into token IDs."""
-    # TODO: this method may not be exact.
-    # TODO: this method may differ based on model (eg codex).
-    try:
-        from transformers import GPT2TokenizerFast
-    except ImportError:
-        raise ValueError(
-            "Could not import transformers python package. "
-            "This is needed in order to calculate get_token_ids. "
-            "Please install it with `pip install transformers`."
-        )
-    # create a GPT-2 tokenizer instance
-    tokenizer = GPT2TokenizerFast.from_pretrained("gpt2")
-
-    # tokenize the text using the GPT-2 tokenizer
-    return tokenizer.encode(text)
-
-
-class BaseLanguageModel(Serializable, ABC):
-    """Base class for all language models."""
-
-    @abstractmethod
-    def generate_prompt(
-        self,
-        prompts: List[PromptValue],
-        stop: Optional[List[str]] = None,
-        callbacks: Callbacks = None,
-        **kwargs: Any,
-    ) -> LLMResult:
-        """Take in a list of prompt values and return an LLMResult."""
-
-    @abstractmethod
-    async def agenerate_prompt(
-        self,
-        prompts: List[PromptValue],
-        stop: Optional[List[str]] = None,
-        callbacks: Callbacks = None,
-        **kwargs: Any,
-    ) -> LLMResult:
-        """Take in a list of prompt values and return an LLMResult."""
-
-    @abstractmethod
-    def predict(
-        self, text: str, *, stop: Optional[Sequence[str]] = None, **kwargs: Any
-    ) -> str:
-        """Predict text from text."""
-
-    @abstractmethod
-    def predict_messages(
-        self,
-        messages: List[BaseMessage],
-        *,
-        stop: Optional[Sequence[str]] = None,
-        **kwargs: Any,
-    ) -> BaseMessage:
-        """Predict message from messages."""
-
-    @abstractmethod
-    async def apredict(
-        self, text: str, *, stop: Optional[Sequence[str]] = None, **kwargs: Any
-    ) -> str:
-        """Predict text from text."""
-
-    @abstractmethod
-    async def apredict_messages(
-        self,
-        messages: List[BaseMessage],
-        *,
-        stop: Optional[Sequence[str]] = None,
-        **kwargs: Any,
-    ) -> BaseMessage:
-        """Predict message from messages."""
-
-    def get_token_ids(self, text: str) -> List[int]:
-        """Get the token present in the text."""
-        return _get_token_ids_default_method(text)
-
-    def get_num_tokens(self, text: str) -> int:
-        """Get the number of tokens present in the text."""
-        return len(self.get_token_ids(text))
-
-    def get_num_tokens_from_messages(self, messages: List[BaseMessage]) -> int:
-        """Get the number of tokens in the message."""
-        return sum([self.get_num_tokens(get_buffer_string([m])) for m in messages])
-
-    @classmethod
-    def all_required_field_names(cls) -> Set:
-        all_required_field_names = set()
-        for field in cls.__fields__.values():
-            all_required_field_names.add(field.name)
-            if field.has_alias:
-                all_required_field_names.add(field.alias)
-        return all_required_field_names
+__all__ = ["BaseLanguageModel"]
diff --git a/langchain/chains/api/base.py b/langchain/chains/api/base.py
index 9eb4bc2fcdd..c873b1bc281 100644
--- a/langchain/chains/api/base.py
+++ b/langchain/chains/api/base.py
@@ -5,7 +5,6 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Field, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
@@ -15,6 +14,7 @@ from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.requests import TextRequestsWrapper
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class APIChain(Chain):
diff --git a/langchain/chains/api/openapi/chain.py b/langchain/chains/api/openapi/chain.py
index 039770f7795..c859ced0549 100644
--- a/langchain/chains/api/openapi/chain.py
+++ b/langchain/chains/api/openapi/chain.py
@@ -7,13 +7,13 @@ from typing import Any, Dict, List, NamedTuple, Optional, cast
 from pydantic import BaseModel, Field
 from requests import Response
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun, Callbacks
 from langchain.chains.api.openapi.requests_chain import APIRequesterChain
 from langchain.chains.api.openapi.response_chain import APIResponderChain
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.requests import Requests
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.openapi.utils.api_models import APIOperation
 
 
diff --git a/langchain/chains/api/openapi/requests_chain.py b/langchain/chains/api/openapi/requests_chain.py
index 223a630f630..002cdbe5799 100644
--- a/langchain/chains/api/openapi/requests_chain.py
+++ b/langchain/chains/api/openapi/requests_chain.py
@@ -4,11 +4,11 @@ import json
 import re
 from typing import Any
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.api.openapi.prompts import REQUEST_TEMPLATE
 from langchain.chains.llm import LLMChain
 from langchain.prompts.prompt import PromptTemplate
 from langchain.schema import BaseOutputParser
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class APIRequesterOutputParser(BaseOutputParser):
diff --git a/langchain/chains/api/openapi/response_chain.py b/langchain/chains/api/openapi/response_chain.py
index 21b4af3be47..18b2617e578 100644
--- a/langchain/chains/api/openapi/response_chain.py
+++ b/langchain/chains/api/openapi/response_chain.py
@@ -4,11 +4,11 @@ import json
 import re
 from typing import Any
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.api.openapi.prompts import RESPONSE_TEMPLATE
 from langchain.chains.llm import LLMChain
 from langchain.prompts.prompt import PromptTemplate
 from langchain.schema import BaseOutputParser
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class APIResponderOutputParser(BaseOutputParser):
diff --git a/langchain/chains/constitutional_ai/base.py b/langchain/chains/constitutional_ai/base.py
index 75eeda79cd5..62055aaee9b 100644
--- a/langchain/chains/constitutional_ai/base.py
+++ b/langchain/chains/constitutional_ai/base.py
@@ -1,7 +1,6 @@
 """Chain for applying constitutional principles to the outputs of another chain."""
 from typing import Any, Dict, List, Optional
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.constitutional_ai.models import ConstitutionalPrinciple
@@ -9,6 +8,7 @@ from langchain.chains.constitutional_ai.principles import PRINCIPLES
 from langchain.chains.constitutional_ai.prompts import CRITIQUE_PROMPT, REVISION_PROMPT
 from langchain.chains.llm import LLMChain
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class ConstitutionalChain(Chain):
diff --git a/langchain/chains/conversational_retrieval/base.py b/langchain/chains/conversational_retrieval/base.py
index a39327eb05b..c601d422d53 100644
--- a/langchain/chains/conversational_retrieval/base.py
+++ b/langchain/chains/conversational_retrieval/base.py
@@ -9,7 +9,6 @@ from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 
 from pydantic import Extra, Field, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
@@ -22,6 +21,7 @@ from langchain.chains.conversational_retrieval.prompts import CONDENSE_QUESTION_
 from langchain.chains.llm import LLMChain
 from langchain.chains.question_answering import load_qa_chain
 from langchain.schema import BasePromptTemplate, BaseRetriever, Document
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import BaseMessage
 from langchain.vectorstores.base import VectorStore
 
diff --git a/langchain/chains/flare/base.py b/langchain/chains/flare/base.py
index c52e91c3ed2..df468d7a43d 100644
--- a/langchain/chains/flare/base.py
+++ b/langchain/chains/flare/base.py
@@ -7,7 +7,6 @@ from typing import Any, Dict, List, Optional, Sequence, Tuple
 import numpy as np
 from pydantic import Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     CallbackManagerForChainRun,
 )
@@ -20,6 +19,7 @@ from langchain.chains.flare.prompts import (
 from langchain.chains.llm import LLMChain
 from langchain.llms import OpenAI
 from langchain.schema import BasePromptTemplate, BaseRetriever, Generation
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class _ResponseChain(LLMChain):
diff --git a/langchain/chains/graph_qa/base.py b/langchain/chains/graph_qa/base.py
index b194f2e146d..3082a1d1330 100644
--- a/langchain/chains/graph_qa/base.py
+++ b/langchain/chains/graph_qa/base.py
@@ -5,13 +5,13 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.graph_qa.prompts import ENTITY_EXTRACTION_PROMPT, GRAPH_QA_PROMPT
 from langchain.chains.llm import LLMChain
 from langchain.graphs.networkx_graph import NetworkxEntityGraph, get_entities
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class GraphQAChain(Chain):
diff --git a/langchain/chains/graph_qa/cypher.py b/langchain/chains/graph_qa/cypher.py
index f50195b1a0c..2e8d6a851ab 100644
--- a/langchain/chains/graph_qa/cypher.py
+++ b/langchain/chains/graph_qa/cypher.py
@@ -6,13 +6,13 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.graph_qa.prompts import CYPHER_GENERATION_PROMPT, CYPHER_QA_PROMPT
 from langchain.chains.llm import LLMChain
 from langchain.graphs.neo4j_graph import Neo4jGraph
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 INTERMEDIATE_STEPS_KEY = "intermediate_steps"
 
diff --git a/langchain/chains/graph_qa/hugegraph.py b/langchain/chains/graph_qa/hugegraph.py
index a27da8e2c9c..3984372aeed 100644
--- a/langchain/chains/graph_qa/hugegraph.py
+++ b/langchain/chains/graph_qa/hugegraph.py
@@ -5,7 +5,6 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.graph_qa.prompts import (
@@ -15,6 +14,7 @@ from langchain.chains.graph_qa.prompts import (
 from langchain.chains.llm import LLMChain
 from langchain.graphs.hugegraph import HugeGraph
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class HugeGraphQAChain(Chain):
diff --git a/langchain/chains/graph_qa/kuzu.py b/langchain/chains/graph_qa/kuzu.py
index d373d79f951..e532fa64ca0 100644
--- a/langchain/chains/graph_qa/kuzu.py
+++ b/langchain/chains/graph_qa/kuzu.py
@@ -5,13 +5,13 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.graph_qa.prompts import CYPHER_QA_PROMPT, KUZU_GENERATION_PROMPT
 from langchain.chains.llm import LLMChain
 from langchain.graphs.kuzu_graph import KuzuGraph
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class KuzuQAChain(Chain):
diff --git a/langchain/chains/graph_qa/nebulagraph.py b/langchain/chains/graph_qa/nebulagraph.py
index 377559e7076..9cfcc960a43 100644
--- a/langchain/chains/graph_qa/nebulagraph.py
+++ b/langchain/chains/graph_qa/nebulagraph.py
@@ -5,13 +5,13 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.graph_qa.prompts import CYPHER_QA_PROMPT, NGQL_GENERATION_PROMPT
 from langchain.chains.llm import LLMChain
 from langchain.graphs.nebula_graph import NebulaGraph
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class NebulaGraphQAChain(Chain):
diff --git a/langchain/chains/graph_qa/sparql.py b/langchain/chains/graph_qa/sparql.py
index 5c1389bef26..14e27a867d9 100644
--- a/langchain/chains/graph_qa/sparql.py
+++ b/langchain/chains/graph_qa/sparql.py
@@ -7,7 +7,6 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.graph_qa.prompts import (
@@ -19,6 +18,7 @@ from langchain.chains.graph_qa.prompts import (
 from langchain.chains.llm import LLMChain
 from langchain.graphs.rdf_graph import RdfGraph
 from langchain.prompts.base import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class GraphSparqlQAChain(Chain):
diff --git a/langchain/chains/hyde/base.py b/langchain/chains/hyde/base.py
index 7764c85474f..1fb2f3ac4ce 100644
--- a/langchain/chains/hyde/base.py
+++ b/langchain/chains/hyde/base.py
@@ -9,12 +9,12 @@ from typing import Any, Dict, List, Optional
 import numpy as np
 from pydantic import Extra
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.hyde.prompts import PROMPT_MAP
 from langchain.chains.llm import LLMChain
 from langchain.embeddings.base import Embeddings
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class HypotheticalDocumentEmbedder(Chain, Embeddings):
diff --git a/langchain/chains/llm.py b/langchain/chains/llm.py
index bfb2244d686..40cb3d5ec7a 100644
--- a/langchain/chains/llm.py
+++ b/langchain/chains/llm.py
@@ -6,7 +6,6 @@ from typing import Any, Dict, List, Optional, Sequence, Tuple, Union
 
 from pydantic import Extra, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManager,
     AsyncCallbackManagerForChainRun,
@@ -25,6 +24,7 @@ from langchain.schema import (
     NoOpOutputParser,
     PromptValue,
 )
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class LLMChain(Chain):
diff --git a/langchain/chains/llm_bash/base.py b/langchain/chains/llm_bash/base.py
index f2ec384b655..87644e67b2c 100644
--- a/langchain/chains/llm_bash/base.py
+++ b/langchain/chains/llm_bash/base.py
@@ -7,12 +7,12 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Extra, Field, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.llm_bash.prompt import PROMPT
 from langchain.schema import BasePromptTemplate, OutputParserException
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.utilities.bash import BashProcess
 
 logger = logging.getLogger(__name__)
diff --git a/langchain/chains/llm_checker/base.py b/langchain/chains/llm_checker/base.py
index 080b1e9635d..e32a93fc4ad 100644
--- a/langchain/chains/llm_checker/base.py
+++ b/langchain/chains/llm_checker/base.py
@@ -6,7 +6,6 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Extra, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
@@ -18,6 +17,7 @@ from langchain.chains.llm_checker.prompt import (
 )
 from langchain.chains.sequential import SequentialChain
 from langchain.prompts import PromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def _load_question_to_checked_assertions_chain(
diff --git a/langchain/chains/llm_math/base.py b/langchain/chains/llm_math/base.py
index bce99676712..b5e92620d46 100644
--- a/langchain/chains/llm_math/base.py
+++ b/langchain/chains/llm_math/base.py
@@ -9,7 +9,6 @@ from typing import Any, Dict, List, Optional
 import numexpr
 from pydantic import Extra, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
@@ -18,6 +17,7 @@ from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.llm_math.prompt import PROMPT
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class LLMMathChain(Chain):
diff --git a/langchain/chains/llm_summarization_checker/base.py b/langchain/chains/llm_summarization_checker/base.py
index 3ae9c7070cb..30e7f8ea853 100644
--- a/langchain/chains/llm_summarization_checker/base.py
+++ b/langchain/chains/llm_summarization_checker/base.py
@@ -8,12 +8,12 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Extra, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.sequential import SequentialChain
 from langchain.prompts.prompt import PromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 PROMPTS_DIR = Path(__file__).parent / "prompts"
 
diff --git a/langchain/chains/mapreduce.py b/langchain/chains/mapreduce.py
index 8b217bf0231..e7ba46ba605 100644
--- a/langchain/chains/mapreduce.py
+++ b/langchain/chains/mapreduce.py
@@ -9,7 +9,6 @@ from typing import Any, Dict, List, Mapping, Optional
 
 from pydantic import Extra
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun, Callbacks
 from langchain.chains import ReduceDocumentsChain
 from langchain.chains.base import Chain
@@ -19,6 +18,7 @@ from langchain.chains.combine_documents.stuff import StuffDocumentsChain
 from langchain.chains.llm import LLMChain
 from langchain.docstore.document import Document
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.text_splitter import TextSplitter
 
 
diff --git a/langchain/chains/natbot/base.py b/langchain/chains/natbot/base.py
index b510f89b93e..2adcea4fd79 100644
--- a/langchain/chains/natbot/base.py
+++ b/langchain/chains/natbot/base.py
@@ -6,12 +6,12 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Extra, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.natbot.prompt import PROMPT
 from langchain.llms.openai import OpenAI
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class NatBotChain(Chain):
diff --git a/langchain/chains/openai_functions/citation_fuzzy_match.py b/langchain/chains/openai_functions/citation_fuzzy_match.py
index ac812c4904c..6e31da8c12a 100644
--- a/langchain/chains/openai_functions/citation_fuzzy_match.py
+++ b/langchain/chains/openai_functions/citation_fuzzy_match.py
@@ -2,13 +2,13 @@ from typing import Iterator, List
 
 from pydantic import BaseModel, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.chains.openai_functions.utils import get_llm_kwargs
 from langchain.output_parsers.openai_functions import (
     PydanticOutputFunctionsParser,
 )
 from langchain.prompts.chat import ChatPromptTemplate, HumanMessagePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import HumanMessage, SystemMessage
 
 
diff --git a/langchain/chains/openai_functions/extraction.py b/langchain/chains/openai_functions/extraction.py
index ec4ab46a89d..609bee18d9e 100644
--- a/langchain/chains/openai_functions/extraction.py
+++ b/langchain/chains/openai_functions/extraction.py
@@ -2,7 +2,6 @@ from typing import Any, List
 
 from pydantic import BaseModel
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.openai_functions.utils import (
@@ -15,6 +14,7 @@ from langchain.output_parsers.openai_functions import (
     PydanticAttrOutputFunctionsParser,
 )
 from langchain.prompts import ChatPromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def _get_extraction_function(entity_schema: dict) -> dict:
diff --git a/langchain/chains/openai_functions/openapi.py b/langchain/chains/openai_functions/openapi.py
index a25b67427e2..ed6b6dc173e 100644
--- a/langchain/chains/openai_functions/openapi.py
+++ b/langchain/chains/openai_functions/openapi.py
@@ -8,7 +8,6 @@ from openapi_schema_pydantic import Parameter
 from requests import Response
 
 from langchain import LLMChain
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.sequential import SequentialChain
@@ -17,6 +16,7 @@ from langchain.input import get_colored_text
 from langchain.output_parsers.openai_functions import JsonOutputFunctionsParser
 from langchain.prompts import ChatPromptTemplate
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools import APIOperation
 from langchain.utilities.openapi import OpenAPISpec
 
diff --git a/langchain/chains/openai_functions/qa_with_structure.py b/langchain/chains/openai_functions/qa_with_structure.py
index a3c0584db88..d5dfecc921c 100644
--- a/langchain/chains/openai_functions/qa_with_structure.py
+++ b/langchain/chains/openai_functions/qa_with_structure.py
@@ -2,7 +2,6 @@ from typing import Any, List, Optional, Type, Union
 
 from pydantic import BaseModel, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.chains.openai_functions.utils import get_llm_kwargs
 from langchain.output_parsers.openai_functions import (
@@ -12,6 +11,7 @@ from langchain.output_parsers.openai_functions import (
 from langchain.prompts import PromptTemplate
 from langchain.prompts.chat import ChatPromptTemplate, HumanMessagePromptTemplate
 from langchain.schema import BaseLLMOutputParser
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import HumanMessage, SystemMessage
 
 
diff --git a/langchain/chains/openai_functions/tagging.py b/langchain/chains/openai_functions/tagging.py
index 4eeaad5526b..4bddaabba19 100644
--- a/langchain/chains/openai_functions/tagging.py
+++ b/langchain/chains/openai_functions/tagging.py
@@ -1,6 +1,5 @@
 from typing import Any
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.openai_functions.utils import _convert_schema, get_llm_kwargs
@@ -9,6 +8,7 @@ from langchain.output_parsers.openai_functions import (
     PydanticOutputFunctionsParser,
 )
 from langchain.prompts import ChatPromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def _get_tagging_function(schema: dict) -> dict:
diff --git a/langchain/chains/pal/base.py b/langchain/chains/pal/base.py
index 3e3ada74be5..e97f18c02f1 100644
--- a/langchain/chains/pal/base.py
+++ b/langchain/chains/pal/base.py
@@ -9,13 +9,13 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Extra, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.pal.colored_object_prompt import COLORED_OBJECT_PROMPT
 from langchain.chains.pal.math_prompt import MATH_PROMPT
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.utilities import PythonREPL
 
 
diff --git a/langchain/chains/prompt_selector.py b/langchain/chains/prompt_selector.py
index 4112aba33af..7b23bf26e69 100644
--- a/langchain/chains/prompt_selector.py
+++ b/langchain/chains/prompt_selector.py
@@ -3,10 +3,10 @@ from typing import Callable, List, Tuple
 
 from pydantic import BaseModel, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chat_models.base import BaseChatModel
 from langchain.llms.base import BaseLLM
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class BasePromptSelector(BaseModel, ABC):
diff --git a/langchain/chains/qa_generation/base.py b/langchain/chains/qa_generation/base.py
index 9cc2383570b..02fed9730d2 100644
--- a/langchain/chains/qa_generation/base.py
+++ b/langchain/chains/qa_generation/base.py
@@ -5,12 +5,12 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.qa_generation.prompt import PROMPT_SELECTOR
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.text_splitter import RecursiveCharacterTextSplitter, TextSplitter
 
 
diff --git a/langchain/chains/qa_with_sources/base.py b/langchain/chains/qa_with_sources/base.py
index 5e1799cc290..e05d8949c53 100644
--- a/langchain/chains/qa_with_sources/base.py
+++ b/langchain/chains/qa_with_sources/base.py
@@ -9,7 +9,6 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Extra, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
@@ -28,6 +27,7 @@ from langchain.chains.qa_with_sources.map_reduce_prompt import (
 )
 from langchain.docstore.document import Document
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class BaseQAWithSourcesChain(Chain, ABC):
diff --git a/langchain/chains/qa_with_sources/loading.py b/langchain/chains/qa_with_sources/loading.py
index f8f8ac5f7e5..895c2984eed 100644
--- a/langchain/chains/qa_with_sources/loading.py
+++ b/langchain/chains/qa_with_sources/loading.py
@@ -3,11 +3,10 @@ from __future__ import annotations
 
 from typing import Any, Mapping, Optional, Protocol
 
-from langchain.base_language import BaseLanguageModel
-from langchain.chains import ReduceDocumentsChain
 from langchain.chains.combine_documents.base import BaseCombineDocumentsChain
 from langchain.chains.combine_documents.map_reduce import MapReduceDocumentsChain
 from langchain.chains.combine_documents.map_rerank import MapRerankDocumentsChain
+from langchain.chains.combine_documents.reduce import ReduceDocumentsChain
 from langchain.chains.combine_documents.refine import RefineDocumentsChain
 from langchain.chains.combine_documents.stuff import StuffDocumentsChain
 from langchain.chains.llm import LLMChain
@@ -19,6 +18,7 @@ from langchain.chains.qa_with_sources import (
 from langchain.chains.question_answering.map_rerank_prompt import (
     PROMPT as MAP_RERANK_PROMPT,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.prompt_template import BasePromptTemplate
 
 
diff --git a/langchain/chains/query_constructor/base.py b/langchain/chains/query_constructor/base.py
index 67afc16b5b0..9269ada39d2 100644
--- a/langchain/chains/query_constructor/base.py
+++ b/langchain/chains/query_constructor/base.py
@@ -5,7 +5,6 @@ import json
 from typing import Any, Callable, List, Optional, Sequence
 
 from langchain import FewShotPromptTemplate, LLMChain
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.query_constructor.ir import (
     Comparator,
     Operator,
@@ -24,6 +23,7 @@ from langchain.chains.query_constructor.prompt import (
 from langchain.chains.query_constructor.schema import AttributeInfo
 from langchain.output_parsers.json import parse_and_check_json_markdown
 from langchain.schema import BaseOutputParser, BasePromptTemplate, OutputParserException
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class StructuredQueryOutputParser(BaseOutputParser[StructuredQuery]):
diff --git a/langchain/chains/question_answering/__init__.py b/langchain/chains/question_answering/__init__.py
index 8c2ed5d6530..6e8976625d6 100644
--- a/langchain/chains/question_answering/__init__.py
+++ b/langchain/chains/question_answering/__init__.py
@@ -1,7 +1,6 @@
 """Load question answering chains."""
 from typing import Any, Mapping, Optional, Protocol
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.callbacks.manager import Callbacks
 from langchain.chains import ReduceDocumentsChain
@@ -19,6 +18,7 @@ from langchain.chains.question_answering import (
 from langchain.chains.question_answering.map_rerank_prompt import (
     PROMPT as MAP_RERANK_PROMPT,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.prompt_template import BasePromptTemplate
 
 
diff --git a/langchain/chains/retrieval_qa/base.py b/langchain/chains/retrieval_qa/base.py
index 3ff10aa3d44..19ead7ba582 100644
--- a/langchain/chains/retrieval_qa/base.py
+++ b/langchain/chains/retrieval_qa/base.py
@@ -8,7 +8,6 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Extra, Field, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
@@ -21,6 +20,7 @@ from langchain.chains.question_answering import load_qa_chain
 from langchain.chains.question_answering.stuff_prompt import PROMPT_SELECTOR
 from langchain.prompts import PromptTemplate
 from langchain.schema import BaseRetriever, Document
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.vectorstores.base import VectorStore
 
 
diff --git a/langchain/chains/router/llm_router.py b/langchain/chains/router/llm_router.py
index 27a0e69d551..b0978646133 100644
--- a/langchain/chains/router/llm_router.py
+++ b/langchain/chains/router/llm_router.py
@@ -5,7 +5,6 @@ from typing import Any, Dict, List, Optional, Type, cast
 
 from pydantic import root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
@@ -14,6 +13,7 @@ from langchain.chains import LLMChain
 from langchain.chains.router.base import RouterChain
 from langchain.output_parsers.json import parse_and_check_json_markdown
 from langchain.schema import BaseOutputParser, BasePromptTemplate, OutputParserException
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class LLMRouterChain(RouterChain):
diff --git a/langchain/chains/router/multi_prompt.py b/langchain/chains/router/multi_prompt.py
index 71373743cfc..240d9018c88 100644
--- a/langchain/chains/router/multi_prompt.py
+++ b/langchain/chains/router/multi_prompt.py
@@ -3,13 +3,13 @@ from __future__ import annotations
 
 from typing import Any, Dict, List, Mapping, Optional
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains import ConversationChain
 from langchain.chains.llm import LLMChain
 from langchain.chains.router.base import MultiRouteChain, RouterChain
 from langchain.chains.router.llm_router import LLMRouterChain, RouterOutputParser
 from langchain.chains.router.multi_prompt_prompt import MULTI_PROMPT_ROUTER_TEMPLATE
 from langchain.prompts import PromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class MultiPromptChain(MultiRouteChain):
diff --git a/langchain/chains/router/multi_retrieval_qa.py b/langchain/chains/router/multi_retrieval_qa.py
index 10a2744a68a..183a87bb714 100644
--- a/langchain/chains/router/multi_retrieval_qa.py
+++ b/langchain/chains/router/multi_retrieval_qa.py
@@ -3,7 +3,6 @@ from __future__ import annotations
 
 from typing import Any, Dict, List, Mapping, Optional
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains import ConversationChain
 from langchain.chains.base import Chain
 from langchain.chains.conversation.prompt import DEFAULT_TEMPLATE
@@ -16,6 +15,7 @@ from langchain.chains.router.multi_retrieval_prompt import (
 from langchain.chat_models import ChatOpenAI
 from langchain.prompts import PromptTemplate
 from langchain.schema import BaseRetriever
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class MultiRetrievalQAChain(MultiRouteChain):
diff --git a/langchain/chains/sql_database/base.py b/langchain/chains/sql_database/base.py
index a7f9649cb48..c69fdf0b162 100644
--- a/langchain/chains/sql_database/base.py
+++ b/langchain/chains/sql_database/base.py
@@ -6,13 +6,13 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import Extra, Field, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.chains.llm import LLMChain
 from langchain.chains.sql_database.prompt import DECIDER_PROMPT, PROMPT, SQL_PROMPTS
 from langchain.prompts.prompt import PromptTemplate
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.sql_database import SQLDatabase
 from langchain.tools.sql_database.prompt import QUERY_CHECKER
 
diff --git a/langchain/chains/summarize/__init__.py b/langchain/chains/summarize/__init__.py
index 5645b73fc52..96d6279302b 100644
--- a/langchain/chains/summarize/__init__.py
+++ b/langchain/chains/summarize/__init__.py
@@ -1,15 +1,15 @@
 """Load summarizing chains."""
 from typing import Any, Mapping, Optional, Protocol
 
-from langchain.base_language import BaseLanguageModel
-from langchain.chains import ReduceDocumentsChain
 from langchain.chains.combine_documents.base import BaseCombineDocumentsChain
 from langchain.chains.combine_documents.map_reduce import MapReduceDocumentsChain
+from langchain.chains.combine_documents.reduce import ReduceDocumentsChain
 from langchain.chains.combine_documents.refine import RefineDocumentsChain
 from langchain.chains.combine_documents.stuff import StuffDocumentsChain
 from langchain.chains.llm import LLMChain
 from langchain.chains.summarize import map_reduce_prompt, refine_prompts, stuff_prompt
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class LoadingCallable(Protocol):
diff --git a/langchain/chat_models/base.py b/langchain/chat_models/base.py
index a3480137b57..239ae5689aa 100644
--- a/langchain/chat_models/base.py
+++ b/langchain/chat_models/base.py
@@ -8,7 +8,6 @@ from typing import Any, Dict, List, Mapping, Optional, Sequence
 from pydantic import Field, root_validator
 
 import langchain
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.callbacks.manager import (
     AsyncCallbackManager,
@@ -25,6 +24,7 @@ from langchain.schema import (
     PromptValue,
     RunInfo,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import AIMessage, BaseMessage, HumanMessage
 
 
diff --git a/langchain/chat_models/openai.py b/langchain/chat_models/openai.py
index eb616514386..457a2f7857b 100644
--- a/langchain/chat_models/openai.py
+++ b/langchain/chat_models/openai.py
@@ -205,7 +205,7 @@ class ChatOpenAI(BaseChatModel):
     @root_validator(pre=True)
     def build_extra(cls, values: Dict[str, Any]) -> Dict[str, Any]:
         """Build extra kwargs from additional params that were passed in."""
-        all_required_field_names = cls.all_required_field_names()
+        all_required_field_names = cls._all_required_field_names()
         extra = values.get("model_kwargs", {})
         for field_name in list(values):
             if field_name in extra:
diff --git a/langchain/client/runner_utils.py b/langchain/client/runner_utils.py
index 7c07a93745f..96cc0becacf 100644
--- a/langchain/client/runner_utils.py
+++ b/langchain/client/runner_utils.py
@@ -21,7 +21,6 @@ from typing import (
 from langchainplus_sdk import LangChainPlusClient, RunEvaluator
 from langchainplus_sdk.schemas import Example
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackHandler
 from langchain.callbacks.manager import Callbacks
 from langchain.callbacks.tracers.base import BaseTracer
@@ -34,6 +33,7 @@ from langchain.schema import (
     ChatResult,
     LLMResult,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import (
     BaseMessage,
     HumanMessage,
diff --git a/langchain/evaluation/agents/trajectory_eval_chain.py b/langchain/evaluation/agents/trajectory_eval_chain.py
index b0249da226b..fe34be36706 100644
--- a/langchain/evaluation/agents/trajectory_eval_chain.py
+++ b/langchain/evaluation/agents/trajectory_eval_chain.py
@@ -9,7 +9,6 @@ from typing import Any, Dict, List, NamedTuple, Optional, Sequence, Tuple, Union
 
 from pydantic import Extra, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
@@ -23,6 +22,7 @@ from langchain.evaluation.agents.trajectory_eval_prompt import (
 )
 from langchain.evaluation.schema import AgentTrajectoryEvaluator, LLMEvalChain
 from langchain.schema import AgentAction, BaseOutputParser, OutputParserException
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 
 
diff --git a/langchain/evaluation/comparison/eval_chain.py b/langchain/evaluation/comparison/eval_chain.py
index 4fc1c978d93..d1aa81436d0 100644
--- a/langchain/evaluation/comparison/eval_chain.py
+++ b/langchain/evaluation/comparison/eval_chain.py
@@ -5,13 +5,13 @@ from typing import Any, Optional
 
 from pydantic import Extra, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import Callbacks
 from langchain.chains.llm import LLMChain
 from langchain.evaluation.comparison.prompt import PROMPT, PROMPT_WITH_REFERENCE
 from langchain.evaluation.schema import LLMEvalChain, PairwiseStringEvaluator
 from langchain.prompts.prompt import PromptTemplate
 from langchain.schema import BaseOutputParser
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class PairwiseStringResultOutputParser(BaseOutputParser[dict]):
diff --git a/langchain/evaluation/criteria/eval_chain.py b/langchain/evaluation/criteria/eval_chain.py
index f2dd3c6b084..ea6d9119f20 100644
--- a/langchain/evaluation/criteria/eval_chain.py
+++ b/langchain/evaluation/criteria/eval_chain.py
@@ -4,12 +4,12 @@ from typing import Any, Dict, List, Mapping, Optional, Sequence, Union
 
 from pydantic import Extra, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.constitutional_ai.models import ConstitutionalPrinciple
 from langchain.chains.llm import LLMChain
 from langchain.evaluation.criteria.prompt import PROMPT, PROMPT_WITH_REFERENCES
 from langchain.evaluation.schema import LLMEvalChain, StringEvaluator
 from langchain.schema import BaseOutputParser, BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 _SUPPORTED_CRITERIA = {
     "conciseness": "Is the submission concise and to the point?",
diff --git a/langchain/evaluation/loading.py b/langchain/evaluation/loading.py
index c5ce94ddc59..549b9d6cb5b 100644
--- a/langchain/evaluation/loading.py
+++ b/langchain/evaluation/loading.py
@@ -1,7 +1,6 @@
 """Loading datasets and evaluators."""
 from typing import Any, Dict, List, Optional, Sequence, Type
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.base import Chain
 from langchain.chat_models.openai import ChatOpenAI
 from langchain.evaluation.agents.trajectory_eval_chain import TrajectoryEvalChain
@@ -9,6 +8,7 @@ from langchain.evaluation.comparison import PairwiseStringEvalChain
 from langchain.evaluation.criteria.eval_chain import CriteriaEvalChain
 from langchain.evaluation.qa import ContextQAEvalChain, CotQAEvalChain, QAEvalChain
 from langchain.evaluation.schema import EvaluatorType, LLMEvalChain
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def load_dataset(uri: str) -> List[Dict]:
diff --git a/langchain/evaluation/qa/eval_chain.py b/langchain/evaluation/qa/eval_chain.py
index 725539616c2..cbcb564eaec 100644
--- a/langchain/evaluation/qa/eval_chain.py
+++ b/langchain/evaluation/qa/eval_chain.py
@@ -6,11 +6,11 @@ from typing import Any, List, Optional, Sequence
 from pydantic import Extra
 
 from langchain import PromptTemplate
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import Callbacks
 from langchain.chains.llm import LLMChain
 from langchain.evaluation.qa.eval_prompt import CONTEXT_PROMPT, COT_PROMPT, PROMPT
 from langchain.evaluation.schema import LLMEvalChain, StringEvaluator
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def _parse_string_eval_output(text: str) -> dict:
diff --git a/langchain/evaluation/qa/generate_chain.py b/langchain/evaluation/qa/generate_chain.py
index 8fd01d6a67e..1a2bc24cd20 100644
--- a/langchain/evaluation/qa/generate_chain.py
+++ b/langchain/evaluation/qa/generate_chain.py
@@ -3,9 +3,9 @@ from __future__ import annotations
 
 from typing import Any
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.evaluation.qa.generate_prompt import PROMPT
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class QAGenerateChain(LLMChain):
diff --git a/langchain/evaluation/run_evaluators/implementations.py b/langchain/evaluation/run_evaluators/implementations.py
index 1c8ad643b9f..f627e43bacd 100644
--- a/langchain/evaluation/run_evaluators/implementations.py
+++ b/langchain/evaluation/run_evaluators/implementations.py
@@ -4,7 +4,6 @@ from langchainplus_sdk.evaluation import EvaluationResult
 from langchainplus_sdk.schemas import Example, Run, RunTypeEnum
 from pydantic import BaseModel, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chat_models.base import BaseChatModel
 from langchain.evaluation.agents.trajectory_eval_chain import (
     TrajectoryEvalChain,
@@ -24,6 +23,7 @@ from langchain.evaluation.run_evaluators.base import (
 )
 from langchain.prompts.prompt import PromptTemplate
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 
 _QA_PROMPTS = {
diff --git a/langchain/evaluation/schema.py b/langchain/evaluation/schema.py
index 57fea9e6cc4..1f76aeecfbb 100644
--- a/langchain/evaluation/schema.py
+++ b/langchain/evaluation/schema.py
@@ -7,9 +7,9 @@ from enum import Enum
 from typing import Any, Optional, Sequence, Tuple
 from warnings import warn
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.base import Chain
 from langchain.schema.agent import AgentAction
+from langchain.schema.language_model import BaseLanguageModel
 
 logger = logging.getLogger(__name__)
 
diff --git a/langchain/example_generator.py b/langchain/example_generator.py
index e1ce34d8fcc..e825b9eb988 100644
--- a/langchain/example_generator.py
+++ b/langchain/example_generator.py
@@ -1,10 +1,10 @@
 """Utility functions for working with prompts."""
 from typing import List
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.prompts.few_shot import FewShotPromptTemplate
 from langchain.prompts.prompt import PromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 TEST_GEN_TEMPLATE_SUFFIX = "Add another example."
 
diff --git a/langchain/experimental/autonomous_agents/baby_agi/baby_agi.py b/langchain/experimental/autonomous_agents/baby_agi/baby_agi.py
index ba87e5edede..446a676cac8 100644
--- a/langchain/experimental/autonomous_agents/baby_agi/baby_agi.py
+++ b/langchain/experimental/autonomous_agents/baby_agi/baby_agi.py
@@ -4,7 +4,6 @@ from typing import Any, Dict, List, Optional
 
 from pydantic import BaseModel, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 from langchain.experimental.autonomous_agents.baby_agi.task_creation import (
@@ -16,6 +15,7 @@ from langchain.experimental.autonomous_agents.baby_agi.task_execution import (
 from langchain.experimental.autonomous_agents.baby_agi.task_prioritization import (
     TaskPrioritizationChain,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.vectorstores.base import VectorStore
 
 
diff --git a/langchain/experimental/autonomous_agents/baby_agi/task_creation.py b/langchain/experimental/autonomous_agents/baby_agi/task_creation.py
index d3a1dc81567..7f7713cdc8d 100644
--- a/langchain/experimental/autonomous_agents/baby_agi/task_creation.py
+++ b/langchain/experimental/autonomous_agents/baby_agi/task_creation.py
@@ -1,5 +1,5 @@
 from langchain import LLMChain, PromptTemplate
-from langchain.base_language import BaseLanguageModel
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class TaskCreationChain(LLMChain):
diff --git a/langchain/experimental/autonomous_agents/baby_agi/task_execution.py b/langchain/experimental/autonomous_agents/baby_agi/task_execution.py
index aac943c03fe..d968395c852 100644
--- a/langchain/experimental/autonomous_agents/baby_agi/task_execution.py
+++ b/langchain/experimental/autonomous_agents/baby_agi/task_execution.py
@@ -1,5 +1,5 @@
 from langchain import LLMChain, PromptTemplate
-from langchain.base_language import BaseLanguageModel
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class TaskExecutionChain(LLMChain):
diff --git a/langchain/experimental/autonomous_agents/baby_agi/task_prioritization.py b/langchain/experimental/autonomous_agents/baby_agi/task_prioritization.py
index d8b44c585d4..34affa398a1 100644
--- a/langchain/experimental/autonomous_agents/baby_agi/task_prioritization.py
+++ b/langchain/experimental/autonomous_agents/baby_agi/task_prioritization.py
@@ -1,5 +1,5 @@
 from langchain import LLMChain, PromptTemplate
-from langchain.base_language import BaseLanguageModel
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class TaskPrioritizationChain(LLMChain):
diff --git a/langchain/experimental/generative_agents/generative_agent.py b/langchain/experimental/generative_agents/generative_agent.py
index 187a0d0c1e1..3d3db854c43 100644
--- a/langchain/experimental/generative_agents/generative_agent.py
+++ b/langchain/experimental/generative_agents/generative_agent.py
@@ -5,9 +5,9 @@ from typing import Any, Dict, List, Optional, Tuple
 from pydantic import BaseModel, Field
 
 from langchain import LLMChain
-from langchain.base_language import BaseLanguageModel
 from langchain.experimental.generative_agents.memory import GenerativeAgentMemory
 from langchain.prompts import PromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class GenerativeAgent(BaseModel):
diff --git a/langchain/experimental/generative_agents/memory.py b/langchain/experimental/generative_agents/memory.py
index b828b05f97e..67303f9c106 100644
--- a/langchain/experimental/generative_agents/memory.py
+++ b/langchain/experimental/generative_agents/memory.py
@@ -4,10 +4,10 @@ from datetime import datetime
 from typing import Any, Dict, List, Optional
 
 from langchain import LLMChain
-from langchain.base_language import BaseLanguageModel
 from langchain.prompts import PromptTemplate
 from langchain.retrievers import TimeWeightedVectorStoreRetriever
 from langchain.schema import BaseMemory, Document
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.utils import mock_now
 
 logger = logging.getLogger(__name__)
diff --git a/langchain/experimental/plan_and_execute/executors/agent_executor.py b/langchain/experimental/plan_and_execute/executors/agent_executor.py
index 26abdf2c5f6..2b452d8f90c 100644
--- a/langchain/experimental/plan_and_execute/executors/agent_executor.py
+++ b/langchain/experimental/plan_and_execute/executors/agent_executor.py
@@ -2,8 +2,8 @@ from typing import List
 
 from langchain.agents.agent import AgentExecutor
 from langchain.agents.structured_chat.base import StructuredChatAgent
-from langchain.base_language import BaseLanguageModel
 from langchain.experimental.plan_and_execute.executors.base import ChainExecutor
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools import BaseTool
 
 HUMAN_MESSAGE_TEMPLATE = """Previous steps: {previous_steps}
diff --git a/langchain/experimental/plan_and_execute/planners/chat_planner.py b/langchain/experimental/plan_and_execute/planners/chat_planner.py
index 1fb879a68f0..68eb5dad205 100644
--- a/langchain/experimental/plan_and_execute/planners/chat_planner.py
+++ b/langchain/experimental/plan_and_execute/planners/chat_planner.py
@@ -1,6 +1,5 @@
 import re
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains import LLMChain
 from langchain.experimental.plan_and_execute.planners.base import LLMPlanner
 from langchain.experimental.plan_and_execute.schema import (
@@ -9,6 +8,7 @@ from langchain.experimental.plan_and_execute.schema import (
     Step,
 )
 from langchain.prompts import ChatPromptTemplate, HumanMessagePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import SystemMessage
 
 SYSTEM_PROMPT = (
diff --git a/langchain/indexes/graph.py b/langchain/indexes/graph.py
index 171826d68e8..ddc4e00400f 100644
--- a/langchain/indexes/graph.py
+++ b/langchain/indexes/graph.py
@@ -3,12 +3,12 @@ from typing import Optional, Type
 
 from pydantic import BaseModel
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.graphs.networkx_graph import NetworkxEntityGraph, parse_triples
 from langchain.indexes.prompts.knowledge_triplet_extraction import (
     KNOWLEDGE_TRIPLE_EXTRACTION_PROMPT,
 )
+from langchain.schema.language_model import BaseLanguageModel
 
 
 class GraphIndexCreator(BaseModel):
diff --git a/langchain/indexes/vectorstore.py b/langchain/indexes/vectorstore.py
index f07d01a676d..daa83092d07 100644
--- a/langchain/indexes/vectorstore.py
+++ b/langchain/indexes/vectorstore.py
@@ -2,7 +2,6 @@ from typing import Any, List, Optional, Type
 
 from pydantic import BaseModel, Extra, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.qa_with_sources.retrieval import RetrievalQAWithSourcesChain
 from langchain.chains.retrieval_qa.base import RetrievalQA
 from langchain.document_loaders.base import BaseLoader
@@ -10,6 +9,7 @@ from langchain.embeddings.base import Embeddings
 from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain.llms.openai import OpenAI
 from langchain.schema import Document
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.text_splitter import RecursiveCharacterTextSplitter, TextSplitter
 from langchain.vectorstores.base import VectorStore
 from langchain.vectorstores.chroma import Chroma
diff --git a/langchain/llms/base.py b/langchain/llms/base.py
index 5a3ab0aafba..b11712f61ec 100644
--- a/langchain/llms/base.py
+++ b/langchain/llms/base.py
@@ -33,7 +33,6 @@ from tenacity import (
 )
 
 import langchain
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.base import BaseCallbackManager
 from langchain.callbacks.manager import (
     AsyncCallbackManager,
@@ -49,6 +48,7 @@ from langchain.schema import (
     PromptValue,
     RunInfo,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import AIMessage, BaseMessage, get_buffer_string
 
 logger = logging.getLogger(__name__)
diff --git a/langchain/llms/openai.py b/langchain/llms/openai.py
index ef08c2551ad..4eb28f3b90f 100644
--- a/langchain/llms/openai.py
+++ b/langchain/llms/openai.py
@@ -186,7 +186,7 @@ class BaseOpenAI(BaseLLM):
     @root_validator(pre=True)
     def build_extra(cls, values: Dict[str, Any]) -> Dict[str, Any]:
         """Build extra kwargs from additional params that were passed in."""
-        all_required_field_names = cls.all_required_field_names()
+        all_required_field_names = cls._all_required_field_names()
         extra = values.get("model_kwargs", {})
         for field_name in list(values):
             if field_name in extra:
diff --git a/langchain/memory/entity.py b/langchain/memory/entity.py
index 1da66f3da37..5691ac51abd 100644
--- a/langchain/memory/entity.py
+++ b/langchain/memory/entity.py
@@ -5,7 +5,6 @@ from typing import Any, Dict, Iterable, List, Optional
 
 from pydantic import BaseModel, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.memory.chat_memory import BaseChatMemory
 from langchain.memory.prompt import (
@@ -14,6 +13,7 @@ from langchain.memory.prompt import (
 )
 from langchain.memory.utils import get_prompt_input_key
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import BaseMessage, get_buffer_string
 
 logger = logging.getLogger(__name__)
diff --git a/langchain/memory/kg.py b/langchain/memory/kg.py
index bad45eda9cc..dc1019fc12d 100644
--- a/langchain/memory/kg.py
+++ b/langchain/memory/kg.py
@@ -2,7 +2,6 @@ from typing import Any, Dict, List, Type, Union
 
 from pydantic import Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.graphs import NetworkxEntityGraph
 from langchain.graphs.networkx_graph import KnowledgeTriple, get_entities, parse_triples
@@ -13,6 +12,7 @@ from langchain.memory.prompt import (
 )
 from langchain.memory.utils import get_prompt_input_key
 from langchain.schema import BasePromptTemplate
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import BaseMessage, SystemMessage, get_buffer_string
 
 
diff --git a/langchain/memory/summary.py b/langchain/memory/summary.py
index 7345cd72759..449a4361fed 100644
--- a/langchain/memory/summary.py
+++ b/langchain/memory/summary.py
@@ -4,7 +4,6 @@ from typing import Any, Dict, List, Type
 
 from pydantic import BaseModel, root_validator
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.memory.chat_memory import BaseChatMemory
 from langchain.memory.prompt import SUMMARY_PROMPT
@@ -12,6 +11,7 @@ from langchain.schema import (
     BaseChatMessageHistory,
     BasePromptTemplate,
 )
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import BaseMessage, SystemMessage, get_buffer_string
 
 
diff --git a/langchain/memory/token_buffer.py b/langchain/memory/token_buffer.py
index 63b00007f49..80f76c3b76f 100644
--- a/langchain/memory/token_buffer.py
+++ b/langchain/memory/token_buffer.py
@@ -1,7 +1,7 @@
 from typing import Any, Dict, List
 
-from langchain.base_language import BaseLanguageModel
 from langchain.memory.chat_memory import BaseChatMemory
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.messages import BaseMessage, get_buffer_string
 
 
diff --git a/langchain/output_parsers/fix.py b/langchain/output_parsers/fix.py
index 416f88bb001..750a0654165 100644
--- a/langchain/output_parsers/fix.py
+++ b/langchain/output_parsers/fix.py
@@ -2,10 +2,10 @@ from __future__ import annotations
 
 from typing import TypeVar
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.output_parsers.prompts import NAIVE_FIX_PROMPT
 from langchain.schema import BaseOutputParser, BasePromptTemplate, OutputParserException
+from langchain.schema.language_model import BaseLanguageModel
 
 T = TypeVar("T")
 
diff --git a/langchain/output_parsers/retry.py b/langchain/output_parsers/retry.py
index c0061e4278d..e4af4b23f65 100644
--- a/langchain/output_parsers/retry.py
+++ b/langchain/output_parsers/retry.py
@@ -2,7 +2,6 @@ from __future__ import annotations
 
 from typing import TypeVar
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.llm import LLMChain
 from langchain.prompts.prompt import PromptTemplate
 from langchain.schema import (
@@ -11,6 +10,7 @@ from langchain.schema import (
     OutputParserException,
     PromptValue,
 )
+from langchain.schema.language_model import BaseLanguageModel
 
 NAIVE_COMPLETION_RETRY = """Prompt:
 {prompt}
diff --git a/langchain/retrievers/document_compressors/chain_extract.py b/langchain/retrievers/document_compressors/chain_extract.py
index 94ff43842fd..a50703f2cc2 100644
--- a/langchain/retrievers/document_compressors/chain_extract.py
+++ b/langchain/retrievers/document_compressors/chain_extract.py
@@ -5,13 +5,13 @@ import asyncio
 from typing import Any, Callable, Dict, Optional, Sequence
 
 from langchain import LLMChain, PromptTemplate
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import Callbacks
 from langchain.retrievers.document_compressors.base import BaseDocumentCompressor
 from langchain.retrievers.document_compressors.chain_extract_prompt import (
     prompt_template,
 )
 from langchain.schema import BaseOutputParser, Document
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def default_get_input(query: str, doc: Document) -> Dict[str, Any]:
diff --git a/langchain/retrievers/document_compressors/chain_filter.py b/langchain/retrievers/document_compressors/chain_filter.py
index ae038175a9e..5b4aae949dc 100644
--- a/langchain/retrievers/document_compressors/chain_filter.py
+++ b/langchain/retrievers/document_compressors/chain_filter.py
@@ -2,7 +2,6 @@
 from typing import Any, Callable, Dict, Optional, Sequence
 
 from langchain import LLMChain, PromptTemplate
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import Callbacks
 from langchain.output_parsers.boolean import BooleanOutputParser
 from langchain.retrievers.document_compressors.base import BaseDocumentCompressor
@@ -10,6 +9,7 @@ from langchain.retrievers.document_compressors.chain_filter_prompt import (
     prompt_template,
 )
 from langchain.schema import BasePromptTemplate, Document
+from langchain.schema.language_model import BaseLanguageModel
 
 
 def _get_default_chain_prompt() -> PromptTemplate:
diff --git a/langchain/retrievers/self_query/base.py b/langchain/retrievers/self_query/base.py
index c139ca736b2..60e63087c60 100644
--- a/langchain/retrievers/self_query/base.py
+++ b/langchain/retrievers/self_query/base.py
@@ -5,7 +5,6 @@ from typing import Any, Dict, List, Optional, Type, cast
 from pydantic import BaseModel, Field, root_validator
 
 from langchain import LLMChain
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForRetrieverRun,
     CallbackManagerForRetrieverRun,
@@ -19,6 +18,7 @@ from langchain.retrievers.self_query.pinecone import PineconeTranslator
 from langchain.retrievers.self_query.qdrant import QdrantTranslator
 from langchain.retrievers.self_query.weaviate import WeaviateTranslator
 from langchain.schema import BaseRetriever, Document
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.vectorstores import (
     Chroma,
     MyScale,
diff --git a/langchain/schema/__init__.py b/langchain/schema/__init__.py
index 818ff4113d7..1e660248211 100644
--- a/langchain/schema/__init__.py
+++ b/langchain/schema/__init__.py
@@ -1,5 +1,6 @@
 from langchain.schema.agent import AgentAction, AgentFinish
 from langchain.schema.document import BaseDocumentTransformer, Document
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.schema.memory import BaseChatMessageHistory, BaseMemory
 from langchain.schema.messages import (
     AIMessage,
@@ -66,5 +67,6 @@ __all__ = [
     "BaseOutputParser",
     "BaseLLMOutputParser",
     "BasePromptTemplate",
+    "BaseLanguageModel",
     "format_document",
 ]
diff --git a/langchain/schema/language_model.py b/langchain/schema/language_model.py
new file mode 100644
index 00000000000..2c3727bc7e7
--- /dev/null
+++ b/langchain/schema/language_model.py
@@ -0,0 +1,254 @@
+from __future__ import annotations
+
+from abc import ABC, abstractmethod
+from typing import TYPE_CHECKING, Any, List, Optional, Sequence, Set
+
+from langchain.load.serializable import Serializable
+from langchain.schema.messages import BaseMessage, get_buffer_string
+from langchain.schema.output import LLMResult
+from langchain.schema.prompt import PromptValue
+
+if TYPE_CHECKING:
+    from langchain.callbacks.manager import Callbacks
+
+
+def _get_token_ids_default_method(text: str) -> List[int]:
+    """Encode the text into token IDs."""
+    # TODO: this method may not be exact.
+    # TODO: this method may differ based on model (eg codex).
+    try:
+        from transformers import GPT2TokenizerFast
+    except ImportError:
+        raise ImportError(
+            "Could not import transformers python package. "
+            "This is needed in order to calculate get_token_ids. "
+            "Please install it with `pip install transformers`."
+        )
+    # create a GPT-2 tokenizer instance
+    tokenizer = GPT2TokenizerFast.from_pretrained("gpt2")
+
+    # tokenize the text using the GPT-2 tokenizer
+    return tokenizer.encode(text)
+
+
+class BaseLanguageModel(Serializable, ABC):
+    """Abstract base class for interfacing with language models.
+
+    All language model wrappers inherit from BaseLanguageModel.
+
+    Exposes three main methods:
+    - generate_prompt: generate language model outputs for a sequence of prompt
+        values. A prompt value is a model input that can be converted to any language
+        model input format (string or messages).
+    - predict: pass in a single string to a language model and return a string
+        prediction.
+    - predict_messages: pass in a sequence of BaseMessages (corresponding to a single
+        model call) to a language model and return a BaseMessage prediction.
+
+    Each of these has an equivalent asynchronous method.
+    """
+
+    @abstractmethod
+    def generate_prompt(
+        self,
+        prompts: List[PromptValue],
+        stop: Optional[List[str]] = None,
+        callbacks: Callbacks = None,
+        **kwargs: Any,
+    ) -> LLMResult:
+        """Pass a sequence of prompts to the model and return model generations.
+
+        This method should make use of batched calls for models that expose a batched
+        API.
+
+        Use this method when you want to:
+            1. take advantage of batched calls,
+            2. need more output from the model than just the top generated value,
+            3. are building chains that are agnostic to the underlying language model
+                type (e.g., pure text completion models vs chat models).
+
+        Args:
+            prompts: List of PromptValues. A PromptValue is an object that can be
+                converted to match the format of any language model (string for pure
+                text generation models and BaseMessages for chat models).
+            stop: Stop words to use when generating. Model output is cut off at the
+                first occurrence of any of these substrings.
+            callbacks: Callbacks to pass through. Used for executing additional
+                functionality, such as logging or streaming, throughout generation.
+            **kwargs: Arbitrary additional keyword arguments. These are usually passed
+                to the model provider API call.
+
+        Returns:
+            An LLMResult, which contains a list of candidate Generations for each input
+                prompt and additional model provider-specific output.
+        """
+
+    @abstractmethod
+    async def agenerate_prompt(
+        self,
+        prompts: List[PromptValue],
+        stop: Optional[List[str]] = None,
+        callbacks: Callbacks = None,
+        **kwargs: Any,
+    ) -> LLMResult:
+        """Asynchronously pass a sequence of prompts and return model generations.
+
+        This method should make use of batched calls for models that expose a batched
+        API.
+
+        Use this method when you want to:
+            1. take advantage of batched calls,
+            2. need more output from the model than just the top generated value,
+            3. are building chains that are agnostic to the underlying language model
+                type (e.g., pure text completion models vs chat models).
+
+        Args:
+            prompts: List of PromptValues. A PromptValue is an object that can be
+                converted to match the format of any language model (string for pure
+                text generation models and BaseMessages for chat models).
+            stop: Stop words to use when generating. Model output is cut off at the
+                first occurrence of any of these substrings.
+            callbacks: Callbacks to pass through. Used for executing additional
+                functionality, such as logging or streaming, throughout generation.
+            **kwargs: Arbitrary additional keyword arguments. These are usually passed
+                to the model provider API call.
+
+        Returns:
+            An LLMResult, which contains a list of candidate Generations for each input
+                prompt and additional model provider-specific output.
+        """
+
+    @abstractmethod
+    def predict(
+        self, text: str, *, stop: Optional[Sequence[str]] = None, **kwargs: Any
+    ) -> str:
+        """Pass a single string input to the model and return a string prediction.
+
+         Use this method when passing in raw text. If you want to pass in specific
+            types of chat messages, use predict_messages.
+
+        Args:
+            text: String input to pass to the model.
+            stop: Stop words to use when generating. Model output is cut off at the
+                first occurrence of any of these substrings.
+            **kwargs: Arbitrary additional keyword arguments. These are usually passed
+                to the model provider API call.
+
+        Returns:
+            Top model prediction as a string.
+        """
+
+    @abstractmethod
+    def predict_messages(
+        self,
+        messages: List[BaseMessage],
+        *,
+        stop: Optional[Sequence[str]] = None,
+        **kwargs: Any,
+    ) -> BaseMessage:
+        """Pass a message sequence to the model and return a message prediction.
+
+        Use this method when passing in chat messages. If you want to pass in raw text,
+            use predict.
+
+        Args:
+            messages: A sequence of chat messages corresponding to a single model input.
+            stop: Stop words to use when generating. Model output is cut off at the
+                first occurrence of any of these substrings.
+            **kwargs: Arbitrary additional keyword arguments. These are usually passed
+                to the model provider API call.
+
+        Returns:
+            Top model prediction as a message.
+        """
+
+    @abstractmethod
+    async def apredict(
+        self, text: str, *, stop: Optional[Sequence[str]] = None, **kwargs: Any
+    ) -> str:
+        """Asynchronously pass a string to the model and return a string prediction.
+
+        Use this method when calling pure text generation models and only the top
+            candidate generation is needed.
+
+        Args:
+            text: String input to pass to the model.
+            stop: Stop words to use when generating. Model output is cut off at the
+                first occurrence of any of these substrings.
+            **kwargs: Arbitrary additional keyword arguments. These are usually passed
+                to the model provider API call.
+
+        Returns:
+            Top model prediction as a string.
+        """
+
+    @abstractmethod
+    async def apredict_messages(
+        self,
+        messages: List[BaseMessage],
+        *,
+        stop: Optional[Sequence[str]] = None,
+        **kwargs: Any,
+    ) -> BaseMessage:
+        """Asynchronously pass messages to the model and return a message prediction.
+
+        Use this method when calling chat models and only the top
+            candidate generation is needed.
+
+        Args:
+            messages: A sequence of chat messages corresponding to a single model input.
+            stop: Stop words to use when generating. Model output is cut off at the
+                first occurrence of any of these substrings.
+            **kwargs: Arbitrary additional keyword arguments. These are usually passed
+                to the model provider API call.
+
+        Returns:
+            Top model prediction as a message.
+        """
+
+    def get_token_ids(self, text: str) -> List[int]:
+        """Return the ordered ids of the tokens in a text.
+
+        Args:
+            text: The string input to tokenize.
+
+        Returns:
+            A list of ids corresponding to the tokens in the text, in order they occur
+                in the text.
+        """
+        return _get_token_ids_default_method(text)
+
+    def get_num_tokens(self, text: str) -> int:
+        """Get the number of tokens present in the text.
+
+        Useful for checking if an input will fit in a model's context window.
+
+        Args:
+            text: The string input to tokenize.
+
+        Returns:
+            The integer number of tokens in the text.
+        """
+        return len(self.get_token_ids(text))
+
+    def get_num_tokens_from_messages(self, messages: List[BaseMessage]) -> int:
+        """Get the number of tokens in the messages.
+
+        Useful for checking if an input will fit in a model's context window.
+
+        Args:
+            messages: The message inputs to tokenize.
+
+        Returns:
+            The sum of the number of tokens across the messages.
+        """
+        return sum([self.get_num_tokens(get_buffer_string([m])) for m in messages])
+
+    @classmethod
+    def _all_required_field_names(cls) -> Set:
+        all_required_field_names = set()
+        for field in cls.__fields__.values():
+            all_required_field_names.add(field.name)
+            if field.has_alias:
+                all_required_field_names.add(field.alias)
+        return all_required_field_names
diff --git a/langchain/tools/spark_sql/tool.py b/langchain/tools/spark_sql/tool.py
index 43f862aa253..0b23741e923 100644
--- a/langchain/tools/spark_sql/tool.py
+++ b/langchain/tools/spark_sql/tool.py
@@ -4,7 +4,7 @@ from typing import Any, Dict, Optional
 
 from pydantic import BaseModel, Extra, Field, root_validator
 
-from langchain.base_language import BaseLanguageModel
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForToolRun,
     CallbackManagerForToolRun,
diff --git a/langchain/tools/sql_database/tool.py b/langchain/tools/sql_database/tool.py
index 11254047f91..5ab9a10ef45 100644
--- a/langchain/tools/sql_database/tool.py
+++ b/langchain/tools/sql_database/tool.py
@@ -4,7 +4,7 @@ from typing import Any, Dict, Optional
 
 from pydantic import BaseModel, Extra, Field, root_validator
 
-from langchain.base_language import BaseLanguageModel
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForToolRun,
     CallbackManagerForToolRun,
diff --git a/langchain/tools/vectorstore/tool.py b/langchain/tools/vectorstore/tool.py
index c5fae60440a..126f4bbd4a0 100644
--- a/langchain/tools/vectorstore/tool.py
+++ b/langchain/tools/vectorstore/tool.py
@@ -5,13 +5,13 @@ from typing import Any, Dict, Optional
 
 from pydantic import BaseModel, Field
 
-from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForToolRun,
     CallbackManagerForToolRun,
 )
 from langchain.chains import RetrievalQA, RetrievalQAWithSourcesChain
 from langchain.llms.openai import OpenAI
+from langchain.schema.language_model import BaseLanguageModel
 from langchain.tools.base import BaseTool
 from langchain.vectorstores.base import VectorStore
 
diff --git a/tests/integration_tests/test_schema.py b/tests/integration_tests/test_schema.py
index 4c062244c09..9ff2609476f 100644
--- a/tests/integration_tests/test_schema.py
+++ b/tests/integration_tests/test_schema.py
@@ -1,6 +1,6 @@
 """Test formatting functionality."""
 
-from langchain.base_language import _get_token_ids_default_method
+from langchain.schema.language_model import _get_token_ids_default_method
 
 
 class TestTokenCountingWithGPT2Tokenizer:
diff --git a/tests/unit_tests/client/test_runner_utils.py b/tests/unit_tests/client/test_runner_utils.py
index 3c767cdfcc0..5deae684548 100644
--- a/tests/unit_tests/client/test_runner_utils.py
+++ b/tests/unit_tests/client/test_runner_utils.py
@@ -8,7 +8,6 @@ import pytest
 from langchainplus_sdk.client import LangChainPlusClient
 from langchainplus_sdk.schemas import Dataset, Example
 
-from langchain.base_language import BaseLanguageModel
 from langchain.chains.base import Chain
 from langchain.chains.transform import TransformChain
 from langchain.client.runner_utils import (
@@ -20,6 +19,7 @@ from langchain.client.runner_utils import (
     run_llm_or_chain,
 )
 from langchain.schema import LLMResult
+from langchain.schema.language_model import BaseLanguageModel
 from tests.unit_tests.llms.fake_chat_model import FakeChatModel
 from tests.unit_tests.llms.fake_llm import FakeLLM