使用sub2api调用api,非流式返回中没有content字段。 
{
  "id": "resp_0af09bc0aef987a80b9cfca81eb8f8528e0c",
  "object": "chat.completion",
  "created": 1775548024,
  "model": "gpt-5.4",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 19,
    "completion_tokens": 16,
    "total_tokens": 35
  }
}

...