> ## 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. |