OpenAI モデルの拒否応答はどのようなものですか？

{
  "model": "gpt-5.6-terra",
  "object": "chat.completion",
  "created": 1789712872,
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "I can't help with that request. I can, however, help with a related topic or a rewritten version that stays within the usage policy."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 35,
    "completion_tokens": 54,
    "total_tokens": 89
  }
}

import json
import os
import time
from openai import OpenAI

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

REFUSAL_PREFIXES = ("I can't", "I can’t", "Sorry", "I'm sorry", "I’m sorry", "抱歉")

def translate_batch(lines):
    prompt = "Translate each subtitle line below into English. Output a JSON array only:\n" + json.dumps(lines, ensure_ascii=False)
    resp = client.chat.completions.create(
        model="gpt-5.6-terra",
        messages=[{"role": "user", "content": prompt}],
    )
    text = resp.choices[0].message.content or ""
    try:
        result = json.loads(text)
        if isinstance(result, list) and len(result) == len(lines):
            return result
    except json.JSONDecodeError:
        pass

    # No usable result: record it for later analysis or a retry with another model
    with open("failed_cases.jsonl", "a", encoding="utf-8") as f:
        f.write(json.dumps({
            "time": time.strftime("%Y-%m-%d %H:%M:%S %z"),
            "request_id": resp.id,
            "is_refusal": text.strip().startswith(REFUSAL_PREFIXES),
            "input": lines,
            "output": text,
        }, ensure_ascii=False) + "\n")
    return None