> ## 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.

# CreateAudioTranscriptionsMultipartRequest

## Fields

| Field                    | Type                                                                                                                    | Required             | Description                                                                                                                                                                                     |
| ------------------------ | ----------------------------------------------------------------------------------------------------------------------- | -------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `File`                   | [operations.CreateAudioTranscriptionsMultipartFile](../../models/operations/createaudiotranscriptionsmultipartfile.mdx) | :heavy\_check\_mark: | The audio file to transcribe. The format is derived from the filename extension or the file part content type. Max 25 MB; send larger files as base64 JSON via input\_audio.                    |
| `Language`               | `*string`                                                                                                               | :heavy\_minus\_sign: | The language of the input audio (ISO-639-1).                                                                                                                                                    |
| `Model`                  | `string`                                                                                                                | :heavy\_check\_mark: | The model to use for transcription.                                                                                                                                                             |
| `ResponseFormat`         | [\*operations.ResponseFormat](../../models/operations/responseformat.mdx)                                               | :heavy\_minus\_sign: | The response format. "json" (default) returns \{ text, usage }; "verbose\_json" additionally returns task, language, duration, and segment-level timestamps (OpenAI-compatible providers only). |
| `Temperature`            | `*float64`                                                                                                              | :heavy\_minus\_sign: | The sampling temperature.                                                                                                                                                                       |
| `TimestampGranularities` | \[][operations.TimestampGranularities](../../models/operations/timestampgranularities.mdx)                              | :heavy\_minus\_sign: | Timestamp detail levels to include when response\_format is "verbose\_json". "word" additionally returns word-level timestamps in the words array.                                              |