{
  "output": {
    "message": {
      "role": "assistant",
      "content": [
        { "reasoningContent": { "reasoningText": { "text": "think step by step" } } },
        { "text": "The answer is 4." }
      ]
    }
  },
  "stopReason": "end_turn",
  "usage": {
    "inputTokens": 10,
    "outputTokens": 5,
    "totalTokens": 26,
    "cacheReadInputTokens": 4,
    "cacheWriteInputTokens": 7
  }
}
