BerriAI/litellm · error · ValueError

Parameter {k} is not supported for model {model}. Supported

Error message

Parameter {k} is not supported for model {model}. Supported parameters are {supported_params}. Set drop_params=True to drop unsupported parameters.

What it means

Error "Parameter {k} is not supported for model {model}. Supported parameters are {supported_params}. Set drop_params=True to drop unsupported parameters." thrown in BerriAI/litellm.

Source

Thrown at litellm/llms/openai/image_generation/dall_e_2_transformation.py:39

    def get_supported_openai_params(self, model: str) -> list[OpenAIImageGenerationOptionalParams]:
        return ["n", "response_format", "quality", "size", "user"]

    def map_openai_params(
        self,
        non_default_params: dict,
        optional_params: dict,
        model: str,
        drop_params: bool,
    ) -> dict:
        supported_params: Final = self.get_supported_openai_params(model)
        for k in non_default_params:
            if k not in optional_params:
                if k in supported_params:
                    optional_params[k] = non_default_params[k]
                elif drop_params:
                    pass
                else:
                    raise ValueError(
                        f"Parameter {k} is not supported for model {model}. Supported parameters are {supported_params}. Set drop_params=True to drop unsupported parameters."
                    )

        return optional_params

    def transform_image_generation_response(
        self,
        model: str,
        raw_response: httpx.Response,
        model_response: ImageResponse,
        logging_obj: "LiteLLMLoggingObj",
        request_data: dict,
        optional_params: dict,
        litellm_params: dict,
        encoding: Any,
        api_key: str | None = None,
        json_mode: bool | None = None,
    ) -> ImageResponse:

View on GitHub (pinned to 6c2dcb801b)

Solutions

1. Remove the unsupported parameter for dall-e-2 or set drop_params=True.

When it happens

Trigger: Thrown at litellm/llms/openai/image_generation/dall_e_2_transformation.py:39 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/2f96a0620cd7666a. Report an issue: GitHub.