{"record":{"id":"181289b742bdf9d4","repo":"BerriAI/litellm","slug":"cancel-eval-is-not-supported-for-custom-llm-provi","errorCode":null,"errorMessage":"CANCEL eval is not supported for {custom_llm_provider}","messagePattern":"CANCEL eval is not supported for (.+?)","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"litellm/evals/main.py","lineNumber":1034,"sourceCode":"    try:\n        litellm_logging_obj: Final[LiteLLMLoggingObj] = kwargs.get(\"litellm_logging_obj\")\n        litellm_call_id: Final[str | None] = kwargs.get(\"litellm_call_id\", None)\n        _is_async: Final = kwargs.pop(\"acancel_eval\", False) is True\n\n        # Get LiteLLM parameters\n        litellm_params: Final = GenericLiteLLMParams(**kwargs)\n\n        # Determine provider\n        if custom_llm_provider is None:\n            custom_llm_provider = \"openai\"\n\n        # Get provider config\n        evals_api_provider_config: BaseEvalsAPIConfig | None = ProviderConfigManager.get_provider_evals_api_config(\n            provider=litellm.LlmProviders(custom_llm_provider),\n        )\n\n        if evals_api_provider_config is None:\n            raise ValueError(f\"CANCEL eval is not supported for {custom_llm_provider}\")\n\n        # Validate environment and get headers\n        headers = extra_headers or {}\n        headers = evals_api_provider_config.validate_environment(headers=headers, litellm_params=litellm_params)\n\n        # Transform request\n        api_base: Final = litellm_params.api_base or DEFAULT_OPENAI_API_BASE\n        (\n            url,\n            headers,\n            request_body,\n        ) = evals_api_provider_config.transform_cancel_eval_request(\n            eval_id=eval_id,\n            api_base=api_base,\n            litellm_params=litellm_params,\n            headers=headers,\n        )\n","sourceCodeStart":1016,"sourceCodeEnd":1052,"githubUrl":"https://github.com/BerriAI/litellm/blob/6c2dcb801bf2b75c18f1bb24140e7cf57465cc4d/litellm/evals/main.py#L1016-L1052","documentation":"Raised in litellm.evals.cancel_eval (litellm/evals/main.py:1034) when the provider has no Evals API config. ProviderConfigManager.get_provider_evals_api_config returns a config only for LlmProviders.OPENAI; cancelling eval runs through LiteLLM against any other provider is unsupported and rejected upfront.","triggerScenarios":"Calling litellm.evals.cancel_eval(eval_id=..., custom_llm_provider=<non-openai>); long-running eval cancellation workflows pointed at Azure/Anthropic/etc.","commonSituations":"Ops tooling that cancels runaway evals assuming provider-agnostic support; config templating that injects the deployment provider into all litellm helper calls.","solutions":["Call cancel_eval with custom_llm_provider='openai' (or omit it)","For other providers, cancel runs via their native APIs","Wrap eval-ops code in a provider check so non-OpenAI paths skip litellm.evals entirely"],"exampleFix":"# before\nlitellm.evals.cancel_eval(eval_id=\"eval_123\", custom_llm_provider=\"azure\")\n\n# after\nlitellm.evals.cancel_eval(eval_id=\"eval_123\", custom_llm_provider=\"openai\")","handlingStrategy":"validation","validationCode":"if custom_llm_provider != \"openai\":\n    raise ValueError(\"cancel_eval requires the OpenAI provider\")\nlitellm.evals.cancel_eval(eval_id=eval_id, custom_llm_provider=\"openai\")","typeGuard":"def evals_provider_supported(provider: str) -> bool:\n    return provider == \"openai\"","tryCatchPattern":"try:\n    litellm.evals.cancel_eval(eval_id=eval_id)\nexcept ValueError as e:\n    if \"CANCEL eval is not supported\" in str(e):\n        logger.error(\"eval cancellation is OpenAI-only in litellm\")\n        raise","preventionTips":["Pass 'openai' explicitly in cancellation tooling","Do not template one provider env var across all litellm helpers","Alert on this error in ops pipelines — it means the call never reached the API"],"tags":["evals","provider-support","openai","validation","cancel"],"backgroundTag":null,"analyzedSha":"6c2dcb801bf2b75c18f1bb24140e7cf57465cc4d","analyzedAt":"2026-08-15T07:12:03.035Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}