{"record":{"id":"1d96198db67edd5a","repo":"BerriAI/litellm","slug":"parameter-k-is-not-supported-for-model-model-1d9619","errorCode":null,"errorMessage":"Parameter {k} is not supported for model {model}. Supported parameters are {supported_params}. Set drop_params=True to drop unsupported parameters.","messagePattern":"Parameter (.+?) is not supported for model (.+?)\\. Supported parameters are (.+?)\\. Set drop_params=True to drop unsupported parameters\\.","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"litellm/llms/fal_ai/image_generation/imagen4_transformation.py","lineNumber":86,"sourceCode":"            if k not in optional_params:\n                if k in supported_params:\n                    # Use mapped parameter name if exists\n                    mapped_key = param_mapping.get(k, k)\n                    mapped_value = non_default_params[k]\n\n                    # Transform specific parameters\n                    if k == \"response_format\":\n                        # Imagen4 always returns URLs, so we can ignore this\n                        continue\n                    elif k == \"size\":\n                        # Map OpenAI size format to Imagen4 aspect ratio\n                        mapped_value = self._map_aspect_ratio(mapped_value)\n\n                    optional_params[mapped_key] = mapped_value\n                elif drop_params:\n                    pass\n                else:\n                    raise ValueError(\n                        f\"Parameter {k} is not supported for model {model}. Supported parameters are {supported_params}. Set drop_params=True to drop unsupported parameters.\"\n                    )\n\n        return optional_params\n\n    def _map_aspect_ratio(self, size: str) -> str:\n        \"\"\"\n        Map OpenAI size format to Imagen4 aspect ratio format.\n\n        OpenAI format: \"1024x1024\", \"1792x1024\", etc.\n        Imagen4 format: \"1:1\", \"16:9\", \"9:16\", \"3:4\", \"4:3\"\n\n        Available aspect ratios:\n        - 1:1 (default)\n        - 16:9\n        - 9:16\n        - 3:4\n        - 4:3","sourceCodeStart":68,"sourceCodeEnd":104,"githubUrl":"https://github.com/BerriAI/litellm/blob/6c2dcb801bf2b75c18f1bb24140e7cf57465cc4d/litellm/llms/fal_ai/image_generation/imagen4_transformation.py#L68-L104","documentation":"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.","triggerScenarios":"Thrown at litellm/llms/fal_ai/image_generation/imagen4_transformation.py:86 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Remove the unsupported parameter or set drop_params=True."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"6c2dcb801bf2b75c18f1bb24140e7cf57465cc4d","analyzedAt":"2026-08-15T07:12:03.035Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}