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

# Models

> The TTS models available on the Chariot API, with languages and limits.

## Text-to-speech models

<ParamField path="v0" default="default">
  The current Chariot TTS model. Produces natural English and Indian-language speech. This is the default; you can also set it explicitly with `"model_type": "v0"` in the request body.
</ParamField>

| Model          | `model_type` | Languages                    | Status    |
| -------------- | ------------ | ---------------------------- | --------- |
| Chariot TTS v0 | `v0`         | English (`en`), Hindi (`hi`) | Available |

If you omit `model_type`, requests use `v0`.

## Languages

Chariot voices cover English and Hindi today, across American, British, and Indian accents. The language and accent are properties of the **voice**, not a request parameter, pick a voice in the language you want. Browse and filter the catalog on the [Voices](/guides/text-to-speech/voices) page or with [`GET /v1/voices`](/api-reference/endpoint/get-voices).

## Limits

| Limit                | Value                            | Applies to                            |
| -------------------- | -------------------------------- | ------------------------------------- |
| Max input length     | 500 characters per request       | `POST /v1/tts`, `POST /v1/tts/stream` |
| Output sample rate   | 44.1 kHz, mono                   | All TTS                               |
| Sync output format   | WAV (`audio/wav`)                | `POST /v1/tts`                        |
| Stream output format | Raw PCM, 16-bit LE (`audio/L16`) | `POST /v1/tts/stream`                 |

For longer scripts, split the text into chunks of 500 characters or fewer and synthesize each, or use the [WebSocket API](/guides/text-to-speech/websocket) to feed text incrementally over one connection.

<Note>
  **Coming soon:** speech-to-text (ASR). It is not yet part of the public API, this page will list ASR models when it ships.
</Note>