> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# BatchObjectPromptTokensDetails

Breakdown of tokens used in the prompt.

## Fields

| Field | Type | Required | Description |
| - | - | - | - |
| `audio_tokens` | *OptionalNullable\[int]* | ➖ | Tokens used for input audio. |
| `cache_write_tokens` | *OptionalNullable\[int]* | ➖ | Tokens written to cache. Only returned for models with explicit caching and cache write pricing. |
| `cached_tokens` | *OptionalNullable\[int]* | ➖ | Tokens cached by the endpoint. |
| `file_tokens` | *OptionalNullable\[int]* | ➖ | Tokens used for input files/documents. |
| `video_tokens` | *OptionalNullable\[int]* | ➖ | Tokens used for input video. |