> ## 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.

# ChatRequestServiceTier

The service tier to use for processing this request. `fast` is accepted as an alias for `priority`.

## Example Usage

```python theme={null}
from openrouter.components import ChatRequestServiceTier

# Open enum: unrecognized values are captured as UnrecognizedStr
value: ChatRequestServiceTier = "auto"
```

## Values

This is an open enum. Unrecognized values will not fail type checks.

* `"auto"`
* `"default"`
* `"fast"`
* `"flex"`
* `"priority"`
* `"scale"`