> ## 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.

# Billable

## Example Usage

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

value := components.BillableOutputImage

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

## Values

| Name                     | Value            |
| ------------------------ | ---------------- |
| `BillableOutputImage`    | output\_image    |
| `BillableInputImage`     | input\_image     |
| `BillableInputFont`      | input\_font      |
| `BillableInputReference` | input\_reference |
| `BillableInputText`      | input\_text      |