Claude 거절 시 빈 콘텐츠가 반환되는 이유는 무엇입니까?

event: message_start
data: {"type":"message_start","message":{"id":"msg_xxxxxxxx","content":[],"stop_reason":null,"stop_details":null,"usage":{"input_tokens":2863,"output_tokens":0}, ...}}

event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"refusal","stop_sequence":null,"stop_details":{"type":"refusal","category":"cyber","explanation":"This request triggered cyber-related safeguards. ..."}},"usage":{"input_tokens":2863,"output_tokens":0}}

event: message_stop
data: {"type":"message_stop"}

{
  "id": "msg_xxxxxxxx",
  "object": "chat.completion",
  "model": "claude-sonnet-5",
  "choices": [
    {
      "index": 0,
      "message": { "role": "assistant", "content": "" },
      "finish_reason": "refusal"
    }
  ],
  "usage": { "prompt_tokens": 2863, "total_tokens": 2863 }
}

data: {"object":"chat.completion.chunk","choices":[{"index":0,"delta":{"role":"assistant","content":""}}]}

data: {"object":"chat.completion.chunk","choices":[{"index":0,"delta":{},"finish_reason":"refusal"}]}

data: [DONE]

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["APIYI_API_KEY"],
    base_url="https://api.apiyi.com/v1",
)

def ask(prompt, model="claude-sonnet-5"):
    resp = client.chat.completions.create(
        model=model,
        max_tokens=4096,
        messages=[{"role": "user", "content": prompt}],
    )
    choice = resp.choices[0]
    if choice.finish_reason == "refusal" or not choice.message.content:
        return {"refused": True, "request_id": resp.id}
    return {"refused": False, "text": choice.message.content}