BerriAI/litellm · error · ValueError

Provider config not found for model: {model} and provider: {

Error message

Provider config not found for model: {model} and provider: {custom_llm_provider}

What it means

Error "Provider config not found for model: {model} and provider: {custom_llm_provider}" thrown in BerriAI/litellm.

Source

Thrown at litellm/llms/anthropic/chat/handler.py:362

        optional_params.pop("vertex_count_tokens_location", None)
        _is_function_call: Final = False
        messages = copy.deepcopy(messages)
        headers = AnthropicConfig().validate_environment(
            api_key=api_key,
            headers=headers,
            model=model,
            messages=messages,
            optional_params={**optional_params, "is_vertex_request": is_vertex_request},
            litellm_params=litellm_params,
            api_base=api_base,
        )

        config: Final = ProviderConfigManager.get_provider_chat_config(
            model=model,
            provider=LlmProviders(custom_llm_provider),
        )
        if config is None:
            raise ValueError(f"Provider config not found for model: {model} and provider: {custom_llm_provider}")

        data = config.transform_request(
            model=model,
            messages=messages,
            optional_params={**optional_params, "is_vertex_request": is_vertex_request},
            litellm_params=litellm_params,
            headers=headers,
        )

        headers, data = update_request_with_filtered_beta(
            headers=headers,
            request_data=data,
            provider=custom_llm_provider,
        )

        ## LOGGING
        logging_obj.pre_call(
            input=messages,

View on GitHub (pinned to 6c2dcb801b)

Solutions

1. Use a supported Anthropic model/provider combination or register a provider config.

When it happens

Trigger: Thrown at litellm/llms/anthropic/chat/handler.py:362 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@6c2dcb801b (2026-08-15). Data as JSON: /api/errors/a34b10d01e8cb360. Report an issue: GitHub.