OutputItem

{
    "id": "string",
    "type": "message",
    "role": "assistant",
    "content": [
        {
            "type": "output_text",
            "text": "string",
            "annotations": [
                {
                    "type": "file_citation",
                    "file_id": "string",
                    "index": 0
                }
            ]
        }
    ],
    "status": "in_progress"
}