Description

_get_model_name raises "Model name could not be retrieved" when used with AWS Bedrock, because ChatBedrock class doesn't have corresponding property for model name retrieval.

The proposed fix is to drop _get_model_name entirely to prevent similar mismatch from models we haven't used. Also, _get_model_name is not a necessary step. If there is a need to know the model name, we can explicitly call the property.

e.g.,

from langchain_anthropic import ChatAnthropic
llm = ChatAnthropic(
        model="claude-3-5-sonnet-latest",
        api_key = os.environ.get("ANTHROPIC_API_KEY"),
        base_url= os.environ.get("ANTHROPIC_API_BASE")
    )
llm.model

will render 'claude-3-5-sonnet-latest'

Before this bug is fixed, users could use ChatBedrockConverse instead of ChatBedrock.
https://python.langchain.com/v0.2/docs/integrations/chat/bedrock/#bedrock-converse-api

Screenshot

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