langchain[patch]: infer mistral provider in init_chat_model (#26557)

libs/langchain/langchain/chat_models/base.py

@@ -109,6 +109,7 @@ def init_chat_model(
             - google_vertexai (langchain-google-vertexai)
             - google_genai (langchain-google-genai)
             - bedrock (langchain-aws)
+            - bedrock_converse (langchain-aws)
             - cohere (langchain-cohere)
             - fireworks (langchain-fireworks)
             - together (langchain-together)
@@ -120,12 +121,13 @@ def init_chat_model(
             Will attempt to infer model_provider from model if not specified. The
             following providers will be inferred based on these model prefixes:
 
-            - gpt-3... or gpt-4... -> openai
+            - gpt-3..., gpt-4..., or o1... -> openai
             - claude... -> anthropic
             - amazon.... -> bedrock
             - gemini... -> google_vertexai
             - command... -> cohere
             - accounts/fireworks... -> fireworks
+            - mistral... -> mistralai
         configurable_fields: Which model parameters are
             configurable:
 
@@ -276,8 +278,13 @@ def init_chat_model(
 
     .. versionchanged:: 0.2.12
 
-        Support for Ollama via langchain-ollama package added. Previously
-        langchain-community version of Ollama (now deprecated) was installed by default.
+        Support for ChatOllama via langchain-ollama package added
+        (langchain_ollama.ChatOllama). Previously,
+        the now-deprecated langchain-community version of Ollama was imported
+        (langchain_community.chat_models.ChatOllama).
+
+        Support for langchain_aws.ChatBedrockConverse added
+        (model_provider="bedrock_converse").
 
     """  # noqa: E501
     if not model and not configurable_fields:
@@ -424,7 +431,7 @@ _SUPPORTED_PROVIDERS = {
 
 
 def _attempt_infer_model_provider(model_name: str) -> Optional[str]:
-    if model_name.startswith("gpt-3") or model_name.startswith("gpt-4"):
+    if any(model_name.startswith(pre) for pre in ("gpt-3", "gpt-4", "o1")):
         return "openai"
     elif model_name.startswith("claude"):
         return "anthropic"
@@ -436,6 +443,8 @@ def _attempt_infer_model_provider(model_name: str) -> Optional[str]:
         return "google_vertexai"
     elif model_name.startswith("amazon."):
         return "bedrock"
+    elif model_name.startswith("mistral"):
+        return "mistralai"
     else:
         return None