[
  {
    "type": "response.completed",
    "response": {
      "id": "resp_img2",
      "status": "completed",
      "output": [
        {
          "type": "message",
          "id": "msg_001",
          "role": "assistant",
          "content": [
            {"type": "output_text", "text": "Here is your image."}
          ]
        },
        {
          "type": "image_generation_call",
          "id": "ig_xyz789",
          "output_format": "png",
          "result": "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVR4nGP4z8AAAAMBAQDJ/pLvAAAAAElFTkSuQmCC"
        }
      ],
      "usage": {
        "input_tokens": 8,
        "output_tokens": 3,
        "total_tokens": 11
      }
    }
  }
]