Usage

Token 用量统计。prompt_tokens 为输入 token，completion_tokens 为输出 token，total_tokens 为两者之和。

{
    "prompt_tokens": 25,
    "completion_tokens": 68,
    "total_tokens": 93,
    "prompt_tokens_details": {
        "cached_tokens": 0,
        "text_tokens": 25,
        "audio_tokens": 0,
        "image_tokens": 0
    },
    "completion_tokens_details": {
        "text_tokens": 60,
        "audio_tokens": 0,
        "reasoning_tokens": 8
    }
}