BerriAI/litellm · error · NotImplementedError

get_supported_generate_content_optional_params is not implem

Error message

get_supported_generate_content_optional_params is not implemented

What it means

Error "get_supported_generate_content_optional_params is not implemented" thrown in BerriAI/litellm.

Source

Thrown at litellm/llms/base_llm/google_genai/transformation.py:61

                    classmethod,
                    staticmethod,
                ),
            )
            and v is not None
        }

    @abstractmethod
    def get_supported_generate_content_optional_params(self, model: str) -> list[str]:
        """
        Get the list of supported Google GenAI parameters for the model.

        Args:
            model: The model name

        Returns:
            List of supported parameter names
        """
        raise NotImplementedError("get_supported_generate_content_optional_params is not implemented")

    def get_generate_content_request_top_level_fields(self) -> tuple[str, ...]:
        """
        Native Google ``GenerateContentRequest`` fields that sit at the top level
        (siblings of ``generationConfig``) rather than inside it. The proxy forwards
        these verbatim from a native request so ``generateContent`` is a drop-in for
        Google's REST API.

        Excludes ``contents``, ``model`` and ``tools`` (dedicated params),
        ``systemInstruction`` (dedicated extraction) and ``generationConfig`` (mapped
        to ``config``).
        """
        return ("safetySettings", "toolConfig", "cachedContent", "labels")

    @abstractmethod
    def map_generate_content_optional_params(
        self,
        generate_content_config_dict: GenerateContentConfigDict,

View on GitHub (pinned to 77b7c6c40c)

Solutions

1. Use a concrete Google GenAI config subclass implementing get_supported_generate_content_optional_params.

When it happens

Trigger: Thrown at litellm/llms/base_llm/google_genai/transformation.py:61 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/dad1fe5dc4a22ebc. Report an issue: GitHub.