anthropic[patch]: model type string (#18510)

Author: Erick Friis

libs/partners/anthropic/langchain_anthropic/chat_models.py

@@ -177,7 +177,7 @@ class Config:
  @property
  def _llm_type(self) -> str:
  """Return type of chat model."""
- return "chat-anthropic-messages"
+ return "anthropic-chat"
 
  @root_validator(pre=True)
  def build_extra(cls, values: Dict) -> Dict: