{
  "id": "msg_01XYZ",
  "type": "message",
  "role": "assistant",
  "content": [
    {"type": "text", "text": "The capital of France is Paris."}
  ],
  "model": "claude-opus-5",
  "stop_reason": "end_turn",
  "stop_sequence": null,
  "usage": {"input_tokens": 12, "output_tokens": 8}
}