{
  "model": "claude-opus-5",
  "messages": [
    {"role": "user", "content": "Hello, how are you?"}
  ],
  "max_tokens": 4096,
  "temperature": 0.7,
  "top_p": 0.9,
  "stop_sequences": ["STOP"],
  "metadata": {"user_id": "user-123"}
}