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/aiml/image_generation/transformation.py:73

        return ["n", "response_format", "size"]

    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)
        is_openai_style: Final = self._is_openai_style_model(model)

        for k in non_default_params:
            if k in optional_params:
                continue
            if k not in supported_params:
                if drop_params:
                    continue
                raise ValueError(
                    f"Parameter {k} is not supported for model {model}. Supported parameters are {supported_params}. Set drop_params=True to drop unsupported parameters."
                )

            if is_openai_style:
                optional_params[k] = non_default_params[k]
                continue

            if k == "n":
                optional_params["num_images"] = non_default_params[k]
            elif k == "response_format":
                optional_params["output_format"] = non_default_params[k]
            elif k == "size":
                size_value = non_default_params[k]
                if isinstance(size_value, str) and "x" in size_value:
                    width, height = map(int, size_value.split("x"))
                    optional_params["image_size"] = {
                        "width": width,
                        "height": height,

View on GitHub (pinned to 6c2dcb801b)

Solutions

1. Remove the unsupported parameter or set drop_params=True.

When it happens

Trigger: Thrown at litellm/llms/aiml/image_generation/transformation.py:73 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/7f6e2e1e0faf5d4a. Report an issue: GitHub.