> ## 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

```go theme={null}
import (
	"github.com/OpenRouterTeam/go-sdk/models/components"
)

value := components.ChatRequestServiceTierAuto

// Open enum: custom values can be created with a direct type cast
custom := components.ChatRequestServiceTier("custom_value")
```

## Values

| Name                             | Value    |
| -------------------------------- | -------- |
| `ChatRequestServiceTierAuto`     | auto     |
| `ChatRequestServiceTierDefault`  | default  |
| `ChatRequestServiceTierFast`     | fast     |
| `ChatRequestServiceTierFlex`     | flex     |
| `ChatRequestServiceTierPriority` | priority |
| `ChatRequestServiceTierScale`    | scale    |