diff --git a/libs/community/langchain_community/chat_models/hunyuan.py b/libs/community/langchain_community/chat_models/hunyuan.py
index 958ccd1c6af..1b79c1b201e 100644
--- a/libs/community/langchain_community/chat_models/hunyuan.py
+++ b/libs/community/langchain_community/chat_models/hunyuan.py
@@ -26,6 +26,7 @@ from langchain_core.utils import (
     get_pydantic_field_names,
     pre_init,
 )
+from pydantic import Field
 
 logger = logging.getLogger(__name__)
 
@@ -99,10 +100,12 @@ class ChatHunyuan(BaseChatModel):
     def lc_serializable(self) -> bool:
         return True
 
-    hunyuan_app_id: Optional[int] = Field(default_factory=from_env("HUNYUAN_APP_ID"))
+    hunyuan_app_id: Optional[int] = Field(
+        default_factory=from_env("HUNYUAN_APP_ID", default=None)
+    )
     """Hunyuan App ID"""
     hunyuan_secret_id: Optional[str] = Field(
-        default_factory=from_env("HUNYUAN_SECRET_ID")
+        default_factory=from_env("HUNYUAN_SECRET_ID", default=None)
     )
     """Hunyuan Secret ID"""
     hunyuan_secret_key: Optional[SecretStr] = None
diff --git a/libs/community/langchain_community/chat_models/litellm.py b/libs/community/langchain_community/chat_models/litellm.py
index 7ce20fba965..1a23d3b7d54 100644
--- a/libs/community/langchain_community/chat_models/litellm.py
+++ b/libs/community/langchain_community/chat_models/litellm.py
@@ -57,6 +57,7 @@ from langchain_core.runnables import Runnable
 from langchain_core.tools import BaseTool
 from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
 from langchain_core.utils.function_calling import convert_to_openai_tool
+from pydantic import Field
 
 logger = logging.getLogger(__name__)
 
diff --git a/libs/community/langchain_community/chat_models/octoai.py b/libs/community/langchain_community/chat_models/octoai.py
index e6905cc8b26..a536b51c772 100644
--- a/libs/community/langchain_community/chat_models/octoai.py
+++ b/libs/community/langchain_community/chat_models/octoai.py
@@ -9,6 +9,7 @@ from langchain_core.utils import (
     get_from_dict_or_env,
     pre_init,
 )
+from pydantic import Field
 
 from langchain_community.chat_models.openai import ChatOpenAI
 from langchain_community.utils.openai import is_openai_v1
diff --git a/libs/community/langchain_community/chat_models/openai.py b/libs/community/langchain_community/chat_models/openai.py
index a1677cd105a..810bb9d9ff2 100644
--- a/libs/community/langchain_community/chat_models/openai.py
+++ b/libs/community/langchain_community/chat_models/openai.py
@@ -48,9 +48,11 @@ from langchain_core.pydantic_v1 import BaseModel, Field, root_validator
 from langchain_core.runnables import Runnable
 from langchain_core.utils import (
     from_env,
+    get_from_dict_or_env,
     get_pydantic_field_names,
     pre_init,
 )
+from pydantic import Field
 
 from langchain_community.adapters.openai import (
     convert_dict_to_message,
@@ -206,7 +208,7 @@ class ChatOpenAI(BaseChatModel):
     # Check for classes that derive from this class (as some of them
     # may assume openai_api_key is a str)
     openai_api_key: Optional[str] = Field(
-        default_factory=from_env("OPENAI_API_KEY"), alias="api_key"
+        default_factory=from_env("OPENAI_API_KEY", default=None), alias="api_key"
     )
     """Automatically inferred from env var `OPENAI_API_KEY` if not provided."""
     openai_api_base: Optional[str] = Field(default=None, alias="base_url")
diff --git a/libs/community/langchain_community/chat_models/snowflake.py b/libs/community/langchain_community/chat_models/snowflake.py
index f1bf6af6b5a..81b3e62fd5a 100644
--- a/libs/community/langchain_community/chat_models/snowflake.py
+++ b/libs/community/langchain_community/chat_models/snowflake.py
@@ -20,6 +20,7 @@ from langchain_core.utils import (
     pre_init,
 )
 from langchain_core.utils.utils import build_extra_kwargs
+from pydantic import Field
 
 SUPPORTED_ROLES: List[str] = [
     "system",
@@ -113,29 +114,29 @@ class ChatSnowflakeCortex(BaseChatModel):
     """
 
     snowflake_username: Optional[str] = Field(
-        default_factory=from_env("SNOWFLAKE_USERNAME"), alias="username"
+        default_factory=from_env("SNOWFLAKE_USERNAME", default=None), alias="username"
     )
     """Automatically inferred from env var `SNOWFLAKE_USERNAME` if not provided."""
     snowflake_password: Optional[SecretStr] = Field(default=None, alias="password")
     """Automatically inferred from env var `SNOWFLAKE_PASSWORD` if not provided."""
     snowflake_account: Optional[str] = Field(
-        default_factory=from_env("SNOWFLAKE_ACCOUNT"), alias="account"
+        default_factory=from_env("SNOWFLAKE_ACCOUNT", default=None), alias="account"
     )
     """Automatically inferred from env var `SNOWFLAKE_ACCOUNT` if not provided."""
     snowflake_database: Optional[str] = Field(
-        default_factory=from_env("SNOWFLAKE_DATABASE"), alias="database"
+        default_factory=from_env("SNOWFLAKE_DATABASE", default=None), alias="database"
     )
     """Automatically inferred from env var `SNOWFLAKE_DATABASE` if not provided."""
     snowflake_schema: Optional[str] = Field(
-        default_factory=from_env("SNOWFLAKE_SCHEMA"), alias="schema"
+        default_factory=from_env("SNOWFLAKE_SCHEMA", default=None), alias="schema"
     )
     """Automatically inferred from env var `SNOWFLAKE_SCHEMA` if not provided."""
     snowflake_warehouse: Optional[str] = Field(
-        default_factory=from_env("SNOWFLAKE_WAREHOUSE"), alias="warehouse"
+        default_factory=from_env("SNOWFLAKE_WAREHOUSE", default=None), alias="warehouse"
     )
     """Automatically inferred from env var `SNOWFLAKE_WAREHOUSE` if not provided."""
     snowflake_role: Optional[str] = Field(
-        default_factory=from_env("SNOWFLAKE_ROLE"), alias="role"
+        default_factory=from_env("SNOWFLAKE_ROLE", default=None), alias="role"
     )
     """Automatically inferred from env var `SNOWFLAKE_ROLE` if not provided."""
 
diff --git a/libs/community/langchain_community/embeddings/anyscale.py b/libs/community/langchain_community/embeddings/anyscale.py
index 38c319090d4..964fb5d47e1 100644
--- a/libs/community/langchain_community/embeddings/anyscale.py
+++ b/libs/community/langchain_community/embeddings/anyscale.py
@@ -11,6 +11,7 @@ from langchain_core.utils import (
     get_from_dict_or_env,
     pre_init,
 )
+from pydantic import Field
 
 from langchain_community.embeddings.openai import OpenAIEmbeddings
 from langchain_community.utils.openai import is_openai_v1
diff --git a/libs/community/langchain_community/embeddings/ernie.py b/libs/community/langchain_community/embeddings/ernie.py
index 1a4534f4a45..8b27662395d 100644
--- a/libs/community/langchain_community/embeddings/ernie.py
+++ b/libs/community/langchain_community/embeddings/ernie.py
@@ -6,9 +6,10 @@ from typing import Dict, List, Optional
 import requests
 from langchain_core._api.deprecation import deprecated
 from langchain_core.embeddings import Embeddings
-from langchain_core.pydantic_v1 import BaseModel, Field
+from langchain_core.pydantic_v1 import BaseModel
 from langchain_core.runnables.config import run_in_executor
-from langchain_core.utils import from_env, pre_init
+from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
+from pydantic import Field
 
 logger = logging.getLogger(__name__)
 
@@ -23,9 +24,11 @@ class ErnieEmbeddings(BaseModel, Embeddings):
     ernie_api_base: Optional[str] = Field(
         default_factory=from_env("ERNIE_API_BASE", default="https://aip.baidubce.com")
     )
-    ernie_client_id: Optional[str] = Field(default_factory=from_env("ERNIE_CLIENT_ID"))
+    ernie_client_id: Optional[str] = Field(
+        default_factory=from_env("ERNIE_CLIENT_ID", default=None)
+    )
     ernie_client_secret: Optional[str] = Field(
-        default_factory=from_env("ERNIE_CLIENT_SECRET")
+        default_factory=from_env("ERNIE_CLIENT_SECRET", default=None)
     )
     access_token: Optional[str] = None
 
diff --git a/libs/community/langchain_community/embeddings/octoai_embeddings.py b/libs/community/langchain_community/embeddings/octoai_embeddings.py
index 5cd7f15a265..e73cf170ca0 100644
--- a/libs/community/langchain_community/embeddings/octoai_embeddings.py
+++ b/libs/community/langchain_community/embeddings/octoai_embeddings.py
@@ -7,6 +7,7 @@ from langchain_core.utils import (
     get_from_dict_or_env,
     pre_init,
 )
+from pydantic import Field
 
 from langchain_community.embeddings.openai import OpenAIEmbeddings
 from langchain_community.utils.openai import is_openai_v1
diff --git a/libs/community/langchain_community/embeddings/sambanova.py b/libs/community/langchain_community/embeddings/sambanova.py
index b264ff7530b..1e0d0f15168 100644
--- a/libs/community/langchain_community/embeddings/sambanova.py
+++ b/libs/community/langchain_community/embeddings/sambanova.py
@@ -3,8 +3,9 @@ from typing import Dict, Generator, List, Optional
 
 import requests
 from langchain_core.embeddings import Embeddings
-from langchain_core.pydantic_v1 import BaseModel, Field
+from langchain_core.pydantic_v1 import BaseModel
 from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
+from pydantic import Field
 
 
 class SambaStudioEmbeddings(BaseModel, Embeddings):
diff --git a/libs/community/langchain_community/embeddings/volcengine.py b/libs/community/langchain_community/embeddings/volcengine.py
index eb8d52268a9..b15536bc828 100644
--- a/libs/community/langchain_community/embeddings/volcengine.py
+++ b/libs/community/langchain_community/embeddings/volcengine.py
@@ -4,8 +4,9 @@ import logging
 from typing import Any, Dict, List, Optional
 
 from langchain_core.embeddings import Embeddings
-from langchain_core.pydantic_v1 import BaseModel, Field
-from langchain_core.utils import from_env, pre_init
+from langchain_core.pydantic_v1 import BaseModel
+from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
+from pydantic import Field
 
 logger = logging.getLogger(__name__)
 
@@ -13,11 +14,15 @@ logger = logging.getLogger(__name__)
 class VolcanoEmbeddings(BaseModel, Embeddings):
     """`Volcengine Embeddings` embedding models."""
 
-    volcano_ak: Optional[str] = Field(default_factory=from_env("VOLC_ACCESSKEY"))
+    volcano_ak: Optional[str] = Field(
+        default_factory=from_env("VOLC_ACCESSKEY", default=None)
+    )
     """volcano access key
     learn more from: https://www.volcengine.com/docs/6459/76491#ak-sk"""
 
-    volcano_sk: Optional[str] = Field(default_factory=from_env("VOLC_SECRETKEY"))
+    volcano_sk: Optional[str] = Field(
+        default_factory=from_env("VOLC_SECRETKEY", default=None)
+    )
     """volcano secret key
     learn more from: https://www.volcengine.com/docs/6459/76491#ak-sk"""
 
diff --git a/libs/community/langchain_community/llms/anthropic.py b/libs/community/langchain_community/llms/anthropic.py
index cd9db81f139..dd557bb3240 100644
--- a/libs/community/langchain_community/llms/anthropic.py
+++ b/libs/community/langchain_community/llms/anthropic.py
@@ -29,6 +29,7 @@ from langchain_core.utils import (
     pre_init,
 )
 from langchain_core.utils.utils import build_extra_kwargs, convert_to_secret_str
+from pydantic import Field
 
 
 class _AnthropicCommon(BaseLanguageModel):
diff --git a/libs/community/langchain_community/llms/anyscale.py b/libs/community/langchain_community/llms/anyscale.py
index fb0557bda1c..0c2eb63bb78 100644
--- a/libs/community/langchain_community/llms/anyscale.py
+++ b/libs/community/langchain_community/llms/anyscale.py
@@ -21,6 +21,7 @@ from langchain_core.utils import (
     get_from_dict_or_env,
     pre_init,
 )
+from pydantic import Field
 
 from langchain_community.llms.openai import (
     BaseOpenAI,
diff --git a/libs/community/langchain_community/llms/baichuan.py b/libs/community/langchain_community/llms/baichuan.py
index 07dfcaafdd5..ef0b6283ce8 100644
--- a/libs/community/langchain_community/llms/baichuan.py
+++ b/libs/community/langchain_community/llms/baichuan.py
@@ -14,6 +14,7 @@ from langchain_core.utils import (
     get_from_dict_or_env,
     pre_init,
 )
+from pydantic import Field
 
 from langchain_community.llms.utils import enforce_stop_tokens
 
diff --git a/libs/community/langchain_community/llms/edenai.py b/libs/community/langchain_community/llms/edenai.py
index 112764d7e34..634484a2448 100644
--- a/libs/community/langchain_community/llms/edenai.py
+++ b/libs/community/langchain_community/llms/edenai.py
@@ -10,8 +10,9 @@ from langchain_core.callbacks import (
 )
 from langchain_core.language_models.llms import LLM
 from langchain_core.pydantic_v1 import Field, root_validator
-from langchain_core.utils import from_env, pre_init
+from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
 from langchain_core.utils.pydantic import get_fields
+from pydantic import Field
 
 from langchain_community.llms.utils import enforce_stop_tokens
 from langchain_community.utilities.requests import Requests
@@ -34,7 +35,9 @@ class EdenAI(LLM):
 
     base_url: str = "https://api.edenai.run/v2"
 
-    edenai_api_key: Optional[str] = Field(default_factory=from_env("EDENAI_API_KEY"))
+    edenai_api_key: Optional[str] = Field(
+        default_factory=from_env("EDENAI_API_KEY", default=None)
+    )
 
     feature: Literal["text", "image"] = "text"
     """Which generative feature to use, use text by default"""
diff --git a/libs/community/langchain_community/llms/minimax.py b/libs/community/langchain_community/llms/minimax.py
index 8025142885a..2294f018218 100644
--- a/libs/community/langchain_community/llms/minimax.py
+++ b/libs/community/langchain_community/llms/minimax.py
@@ -22,6 +22,7 @@ from langchain_core.utils import (
     get_from_dict_or_env,
     pre_init,
 )
+from pydantic import Field
 
 from langchain_community.llms.utils import enforce_stop_tokens
 
@@ -77,7 +78,7 @@ class MinimaxCommon(BaseModel):
         default_factory=from_env("MINIMAX_API_HOST", default="https://api.minimax.chat")
     )
     minimax_group_id: Optional[str] = Field(
-        default_factory=from_env("MINIMAX_GROUP_ID")
+        default_factory=from_env("MINIMAX_GROUP_ID", default=None)
     )
     minimax_api_key: Optional[SecretStr] = None
 
diff --git a/libs/community/langchain_community/llms/oci_data_science_model_deployment_endpoint.py b/libs/community/langchain_community/llms/oci_data_science_model_deployment_endpoint.py
index e133397b6e2..78c621dbed3 100644
--- a/libs/community/langchain_community/llms/oci_data_science_model_deployment_endpoint.py
+++ b/libs/community/langchain_community/llms/oci_data_science_model_deployment_endpoint.py
@@ -5,7 +5,8 @@ import requests
 from langchain_core.callbacks import CallbackManagerForLLMRun
 from langchain_core.language_models.llms import LLM
 from langchain_core.pydantic_v1 import Field
-from langchain_core.utils import from_env, pre_init
+from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
+from pydantic import Field
 
 logger = logging.getLogger(__name__)
 
diff --git a/libs/community/langchain_community/llms/octoai_endpoint.py b/libs/community/langchain_community/llms/octoai_endpoint.py
index c746dc4d4a8..da6ff3c4e95 100644
--- a/libs/community/langchain_community/llms/octoai_endpoint.py
+++ b/libs/community/langchain_community/llms/octoai_endpoint.py
@@ -7,6 +7,7 @@ from langchain_core.utils import (
     get_from_dict_or_env,
     pre_init,
 )
+from pydantic import Field
 
 from langchain_community.llms.openai import BaseOpenAI
 from langchain_community.utils.openai import is_openai_v1
diff --git a/libs/community/langchain_community/llms/openai.py b/libs/community/langchain_community/llms/openai.py
index 4773326f69a..c9006722334 100644
--- a/libs/community/langchain_community/llms/openai.py
+++ b/libs/community/langchain_community/llms/openai.py
@@ -37,6 +37,7 @@ from langchain_core.utils import (
 )
 from langchain_core.utils.pydantic import get_fields
 from langchain_core.utils.utils import build_extra_kwargs
+from pydantic import Field
 
 from langchain_community.utils.openai import is_openai_v1
 
@@ -204,7 +205,7 @@ class BaseOpenAI(BaseLLM):
     # Check for classes that derive from this class (as some of them
     # may assume openai_api_key is a str)
     openai_api_key: Optional[str] = Field(
-        default_factory=from_env("OPENAI_API_KEY"), alias="api_key"
+        default_factory=from_env("OPENAI_API_KEY", default=None), alias="api_key"
     )
     """Automatically inferred from env var `OPENAI_API_KEY` if not provided."""
     openai_api_base: Optional[str] = Field(default=None, alias="base_url")
diff --git a/libs/community/langchain_community/llms/pai_eas_endpoint.py b/libs/community/langchain_community/llms/pai_eas_endpoint.py
index 7f898e343be..2b72e61b2c5 100644
--- a/libs/community/langchain_community/llms/pai_eas_endpoint.py
+++ b/libs/community/langchain_community/llms/pai_eas_endpoint.py
@@ -6,7 +6,8 @@ import requests
 from langchain_core.callbacks import CallbackManagerForLLMRun
 from langchain_core.language_models.llms import LLM
 from langchain_core.outputs import GenerationChunk
-from langchain_core.utils import pre_init
+from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
+from pydantic import Field
 
 from langchain_community.llms.utils import enforce_stop_tokens
 
diff --git a/libs/community/langchain_community/llms/sambanova.py b/libs/community/langchain_community/llms/sambanova.py
index 68d2835f209..9b31dd2a403 100644
--- a/libs/community/langchain_community/llms/sambanova.py
+++ b/libs/community/langchain_community/llms/sambanova.py
@@ -5,8 +5,8 @@ import requests
 from langchain_core.callbacks.manager import CallbackManagerForLLMRun
 from langchain_core.language_models.llms import LLM
 from langchain_core.outputs import GenerationChunk
-from langchain_core.pydantic_v1 import Field
 from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
+from pydantic import Field
 
 
 class SVEndpointHandler:
@@ -204,7 +204,7 @@ class Sambaverse(LLM):
     """sambaverse api key"""
 
     sambaverse_model_name: Optional[str] = Field(
-        default_factory=from_env("SAMBAVERSE_MODEL_NAME")
+        default_factory=from_env("SAMBAVERSE_MODEL_NAME", default=None)
     )
     """sambaverse expert model to use"""
 
diff --git a/libs/community/langchain_community/llms/sparkllm.py b/libs/community/langchain_community/llms/sparkllm.py
index ad2a9881785..8db5ef8638a 100644
--- a/libs/community/langchain_community/llms/sparkllm.py
+++ b/libs/community/langchain_community/llms/sparkllm.py
@@ -18,7 +18,8 @@ from langchain_core.callbacks import CallbackManagerForLLMRun
 from langchain_core.language_models.llms import LLM
 from langchain_core.outputs import GenerationChunk
 from langchain_core.pydantic_v1 import Field
-from langchain_core.utils import from_env, pre_init
+from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
+from pydantic import Field
 
 logger = logging.getLogger(__name__)
 
@@ -43,13 +44,13 @@ class SparkLLM(LLM):
 
     client: Any = None  #: :meta private:
     spark_app_id: Optional[str] = Field(
-        default_factory=from_env("IFLYTEK_SPARK_APP_ID")
+        default_factory=from_env("IFLYTEK_SPARK_APP_ID", default=None)
     )
     spark_api_key: Optional[str] = Field(
-        default_factory=from_env("IFLYTEK_SPARK_API_KEY")
+        default_factory=from_env("IFLYTEK_SPARK_API_KEY", default=None)
     )
     spark_api_secret: Optional[str] = Field(
-        default_factory=from_env("IFLYTEK_SPARK_API_SECRET")
+        default_factory=from_env("IFLYTEK_SPARK_API_SECRET", default=None)
     )
     spark_api_url: Optional[str] = Field(
         default_factory=from_env(
diff --git a/libs/community/langchain_community/retrievers/arcee.py b/libs/community/langchain_community/retrievers/arcee.py
index 5a069813b99..ed87a0f6251 100644
--- a/libs/community/langchain_community/retrievers/arcee.py
+++ b/libs/community/langchain_community/retrievers/arcee.py
@@ -2,7 +2,7 @@ from typing import Any, Dict, List, Optional
 
 from langchain_core.callbacks import CallbackManagerForRetrieverRun
 from langchain_core.documents import Document
-from langchain_core.pydantic_v1 import Field, SecretStr
+from langchain_core.pydantic_v1 import SecretStr
 from langchain_core.retrievers import BaseRetriever
 from langchain_core.utils import (
     convert_to_secret_str,
@@ -10,6 +10,7 @@ from langchain_core.utils import (
     get_from_dict_or_env,
     pre_init,
 )
+from pydantic import Field
 
 from langchain_community.utilities.arcee import ArceeWrapper, DALMFilter
 
diff --git a/libs/community/langchain_community/retrievers/google_cloud_documentai_warehouse.py b/libs/community/langchain_community/retrievers/google_cloud_documentai_warehouse.py
index 12b34f7836e..751f3fd1153 100644
--- a/libs/community/langchain_community/retrievers/google_cloud_documentai_warehouse.py
+++ b/libs/community/langchain_community/retrievers/google_cloud_documentai_warehouse.py
@@ -6,7 +6,8 @@ from langchain_core._api.deprecation import deprecated
 from langchain_core.callbacks import CallbackManagerForRetrieverRun
 from langchain_core.documents import Document
 from langchain_core.retrievers import BaseRetriever
-from langchain_core.utils import pre_init
+from langchain_core.utils import from_env, get_from_dict_or_env, pre_init
+from pydantic import Field
 
 from langchain_community.utilities.vertexai import get_client_info