BerriAI/litellm · error · ValueError

Batch record for /v1/completions is missing required `prompt

Error message

Batch record for /v1/completions is missing required `prompt` field: model={openai_request_body.get('model', '')}

What it means

Error "Batch record for /v1/completions is missing required `prompt` field: model={openai_request_body.get('model', '')}" thrown in BerriAI/litellm.

Source

Thrown at litellm/llms/bedrock/files/transformation.py:646

            non_default_params=non_default_params,
            optional_params={},
        )
        return dict(titan_config._transform_request(input=input_text, inference_params=inference_params))

    @staticmethod
    def _transform_text_completion_body_to_chat_body(
        openai_request_body: _OpenAIBatchRecordBody,
    ) -> Mapping[str, object]:
        """
        Rewrite an OpenAI `/v1/completions` batch body as a Chat Completions body.

        Bedrock batch `modelInput` is the model's InvokeModel/Converse body, and
        no Bedrock batch model takes a bare `prompt`, so the wrapping that
        `litellm.text_completion` does in real time has to happen here too.
        """
        prompt: Final = openai_request_body.get("prompt")
        if prompt is None:
            raise ValueError(
                "Batch record for /v1/completions is missing required `prompt` field: "
                f"model={openai_request_body.get('model', '')}"
            )
        return _frozen_mapping(
            chain(
                ((key, value) for key, value in openai_request_body.items() if key != "prompt"),
                (("messages", text_completion_prompt_to_messages(prompt)),),
            )
        )

    @staticmethod
    def _transform_responses_body_to_chat_body(openai_request_body: _OpenAIBatchRecordBody) -> Mapping[str, object]:
        """
        Rewrite an OpenAI `/v1/responses` batch body as a Chat Completions body.

        Delegates to the same Responses-to-Chat bridge the real-time path uses
        for providers without a native Responses API (which is every Bedrock
        model), so `input`, `instructions`, `max_output_tokens` and the tool

View on GitHub (pinned to 6c2dcb801b)

Solutions

1. Include a `prompt` field in each /v1/completions batch record.

When it happens

Trigger: Thrown at litellm/llms/bedrock/files/transformation.py:646 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/0f9425475027eda4. Report an issue: GitHub.