> ## 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

```typescript theme={null}
import { Billable } from "@openrouter/sdk/models";

let value: Billable = "input_font";

// Open enum: unrecognized values are captured as Unrecognized<string>
```

## Values

```typescript theme={null}
"output_image" | "input_image" | "input_font" | "input_reference" | "input_text" | Unrecognized<string>
```