> ## 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.

# STTInputAudio

Base64-encoded audio to transcribe

## Fields

| Field | Type | Required | Description |
| - | - | - | - |
| `Data` | `string` | :heavy\_check\_mark: | Base64-encoded audio data (raw bytes, not a data URI) |
| `Format` | `string` | :heavy\_check\_mark: | Audio format (e.g., wav, mp3, flac, m4a, ogg, webm, aac). Supported formats vary by provider. |