> ## Documentation Index
> Fetch the complete documentation index at: https://handbook.aiql.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Speech-to-speech

> Realtime duplex voice over workspace knowledge

The **speech-to-speech** model is a realtime duplex audio model. A member speaks, the model replies in speech in the same session, and it can call the same workspace tools as [answers](/products/models-answers). It is the call path in [Observatory](/products/observatory), not file transcription. File audio uses [speech-to-text](/products/models-speech-to-text). Playback of a written reply uses [text-to-speech](/products/models-text-to-speech).

## Parameters

The production realtime model accepts speech, text, and images, and returns speech and text.

| Parameter   | Value                                                           |
| ----------- | --------------------------------------------------------------- |
| Kind        | Realtime audio-language model                                   |
| Input       | Speech, text, and images                                        |
| Output      | Speech and text                                                 |
| Context     | 32k tokens                                                      |
| Max output  | 4k tokens                                                       |
| Tools       | Search knowledge, inspect sources, and navigate related records |
| Turn taking | Server-side voice activity detection                            |

## Configuration

| Setting       | How it is configured                                      |
| ------------- | --------------------------------------------------------- |
| Where it runs | Observatory call mode. A live session, not a convert job. |
| Noise         | Near-field reduction is on by default.                    |
| Serving       | AiQL selects the checkpoint and the speaking voice.       |