# PromptTokenDetails

> **Class** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/_openapi_client/types/run/PromptTokenDetails)

`prompt_token_details` is the per-category breakdown of `prompt_tokens`.

Category names are model-specific (for example `cache_read`, `cache_write`). Returned only when the `PROMPT_TOKEN_DETAILS` field is requested.

## Signature

```python
PromptTokenDetails()
```

## Extends

- `BaseModel`

## Properties

- `raw`

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[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/d6cd6082f09e7826a2d6afe444ae6119e61b82a6/python/langsmith/_openapi_client/types/run.py#L148)