---
title: "ChatUsagePromptTokensDetails"
---

Detailed prompt token usage


## Fields

| Field                                                                                            | Type                                                                                             | Required                                                                                         | Description                                                                                      |
| ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ |
| `audio_tokens`                                                                                   | *Optional[int]*                                                                                  | :heavy_minus_sign:                                                                               | Audio input tokens                                                                               |
| `cache_write_tokens`                                                                             | *Optional[int]*                                                                                  | :heavy_minus_sign:                                                                               | Tokens written to cache. Only returned for models with explicit caching and cache write pricing. |
| `cached_tokens`                                                                                  | *Optional[int]*                                                                                  | :heavy_minus_sign:                                                                               | Cached prompt tokens                                                                             |
| `video_tokens`                                                                                   | *Optional[int]*                                                                                  | :heavy_minus_sign:                                                                               | Video input tokens                                                                               |