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/fal_ai/image_generation/flux_schnell_transformation.py:60

        }

        for k in non_default_params:
            if k not in optional_params:
                if k in supported_params:
                    mapped_key = param_mapping.get(k, k)
                    mapped_value = non_default_params[k]

                    if k == "response_format":
                        if mapped_value in ["b64_json", "url"]:
                            mapped_value = "jpeg"
                    elif k == "size":
                        mapped_value = self._map_image_size(mapped_value)

                    optional_params[mapped_key] = mapped_value
                elif drop_params:
                    continue
                else:
                    raise ValueError(
                        f"Parameter {k} is not supported for model {model}. "
                        f"Supported parameters are {supported_params}. "
                        "Set drop_params=True to drop unsupported parameters."
                    )

        return optional_params

    def _map_image_size(self, size: Any) -> Any:
        if isinstance(size, dict):
            return size

        if not isinstance(size, str):
            return size

        if size in self._OPENAI_SIZE_TO_IMAGE_SIZE:
            return self._OPENAI_SIZE_TO_IMAGE_SIZE[size]

        if "x" in size:

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/fal_ai/image_generation/flux_schnell_transformation.py:60 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/64505496445e4be9. Report an issue: GitHub.