anthropic[patch]: standardize init args (#20161)

Related to #20085

docs/docs/get_started/quickstart.mdx

@@ -141,10 +141,10 @@ from langchain_anthropic import ChatAnthropic
 llm = ChatAnthropic(model="claude-3-sonnet-20240229", temperature=0.2, max_tokens=1024)
 ```
 
-If you'd prefer not to set an environment variable you can pass the key in directly via the `anthropic_api_key` named parameter when initiating the Anthropic Chat Model class:
+If you'd prefer not to set an environment variable you can pass the key in directly via the `api_key` named parameter when initiating the Anthropic Chat Model class:
 
 ```python
-llm = ChatAnthropic(anthropic_api_key="...")
+llm = ChatAnthropic(api_key="...")
 ```
 
   </TabItem>

docs/docs/integrations/chat/anthropic.ipynb

@@ -69,7 +69,7 @@
    "source": [
     "The code provided assumes that your ANTHROPIC_API_KEY is set in your environment variables. If you would like to manually specify your API key and also choose a different model, you can use the following code:\n",
     "```python\n",
-    "chat = ChatAnthropic(temperature=0, anthropic_api_key=\"YOUR_API_KEY\", model_name=\"claude-3-opus-20240229\")\n",
+    "chat = ChatAnthropic(temperature=0, api_key=\"YOUR_API_KEY\", model_name=\"claude-3-opus-20240229\")\n",
     "\n",
     "```\n",
     "\n",

docs/docs/modules/model_io/chat/quick_start.ipynb

@@ -52,8 +52,8 @@
    "source": [
     "```{=mdx}\n",
     "<ChatModelTabs\n",
+    "  anthropicParams={`model=\"claude-3-sonnet-20240229\", api_key=\"...\"`}\n",
     "  openaiParams={`model=\"gpt-3.5-turbo-0125\", api_key=\"...\"`}\n",
-    "  anthropicParams={`model=\"claude-3-sonnet-20240229\", anthropic_api_key=\"...\"`}\n",
     "  mistralParams={`model=\"mistral-large-latest\", api_key=\"...\"`}\n",
     "  fireworksParams={`model=\"accounts/fireworks/models/mixtral-8x7b-instruct\", api_key=\"...\"`}\n",
     "  googleParams={`model=\"gemini-pro\", google_api_key=\"...\"`}\n",

docs/docs/modules/model_io/index.mdx

@@ -158,10 +158,10 @@ from langchain_anthropic import ChatAnthropic
 chat_model = ChatAnthropic(model="claude-3-sonnet-20240229", temperature=0.2, max_tokens=1024)
 ```
 
-If you'd prefer not to set an environment variable you can pass the key in directly via the `anthropic_api_key` named parameter when initiating the Anthropic Chat Model class:
+If you'd prefer not to set an environment variable you can pass the key in directly via the `api_key` named parameter when initiating the Anthropic Chat Model class:
 
 ```python
-chat_model = ChatAnthropic(anthropic_api_key="...")
+chat_model = ChatAnthropic(api_key="...")
 ```
 
   </TabItem>

docs/docs/modules/model_io/quick_start.mdx

@@ -87,10 +87,10 @@ from langchain_anthropic import ChatAnthropic
 chat_model = ChatAnthropic(model="claude-3-sonnet-20240229", temperature=0.2, max_tokens=1024)
 ```
 
-If you'd prefer not to set an environment variable you can pass the key in directly via the `anthropic_api_key` named parameter when initiating the Anthropic Chat Model class:
+If you'd prefer not to set an environment variable you can pass the key in directly via the `api_key` named parameter when initiating the Anthropic Chat Model class:
 
 ```python
-chat_model = ChatAnthropic(anthropic_api_key="...")
+chat_model = ChatAnthropic(api_key="...")
 ```
 
   </TabItem>

libs/partners/anthropic/langchain_anthropic/chat_models.py

@@ -243,12 +243,13 @@ class ChatAnthropic(BaseChatModel):
     top_p: Optional[float] = None
     """Total probability mass of tokens to consider at each step."""
 
-    default_request_timeout: Optional[float] = None
+    default_request_timeout: Optional[float] = Field(None, alias="timeout")
     """Timeout for requests to Anthropic Completion API. Default is 600 seconds."""
 
     anthropic_api_url: str = "https://api.anthropic.com"
 
-    anthropic_api_key: Optional[SecretStr] = None
+    anthropic_api_key: Optional[SecretStr] = Field(None, alias="api_key")
+    """Automatically read from env var `ANTHROPIC_API_KEY` if not provided."""
 
     default_headers: Optional[Mapping[str, str]] = None
     """Headers to pass to the Anthropic clients, will be used for every API call."""

libs/partners/anthropic/tests/unit_tests/test_chat_models.py

@@ -1,16 +1,16 @@
 """Test chat model integration."""
 
 import os
-from typing import Any, Callable, Dict, Literal, Type
+from typing import Any, Callable, Dict, Literal, Type, cast
 
 import pytest
 from anthropic.types import ContentBlock, Message, Usage
 from langchain_core.messages import AIMessage, HumanMessage, SystemMessage, ToolMessage
 from langchain_core.outputs import ChatGeneration, ChatResult
-from langchain_core.pydantic_v1 import BaseModel, Field
+from langchain_core.pydantic_v1 import BaseModel, Field, SecretStr
 from langchain_core.tools import BaseTool
 
-from langchain_anthropic import ChatAnthropic, ChatAnthropicMessages
+from langchain_anthropic import ChatAnthropic
 from langchain_anthropic.chat_models import _merge_messages, convert_to_anthropic_tool
 
 os.environ["ANTHROPIC_API_KEY"] = "foo"
@@ -18,8 +18,17 @@ os.environ["ANTHROPIC_API_KEY"] = "foo"
 
 def test_initialization() -> None:
     """Test chat model initialization."""
-    ChatAnthropicMessages(model_name="claude-instant-1.2", anthropic_api_key="xyz")
-    ChatAnthropicMessages(model="claude-instant-1.2", anthropic_api_key="xyz")
+    for model in [
+        ChatAnthropic(model_name="claude-instant-1.2", api_key="xyz", timeout=2),
+        ChatAnthropic(
+            model="claude-instant-1.2",
+            anthropic_api_key="xyz",
+            default_request_timeout=2,
+        ),
+    ]:
+        assert model.model == "claude-instant-1.2"
+        assert cast(SecretStr, model.anthropic_api_key).get_secret_value() == "xyz"
+        assert model.default_request_timeout == 2.0
 
 
 @pytest.mark.requires("anthropic")