[Bug]: Anthropic messages provider config not found for model

[biscuit279]

What happened?

When I use
"model": "anthropic.claude-sonnet-4",
An error occured：
Anthropic messages provider config not found for model.
How to fix this?

Relevant log output

Are you a ML Ops Team?

No

What LiteLLM version are you on ?

v1.72.0

Twitter / LinkedIn details

No response

[biscuit279]

litellm.BadRequestError: LLM Provider NOT provided. Pass in the LLM provider you are trying to call. You passed model=anthropic.claude-sonnet-4

Bug message above.