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xAIGrok Voice familyCurrentSpeech and audioReleased 17 Apr 2026

Grok Text to Speech (Grok TTS API)

Call POST https://api.x.ai/v1/tts with your text and a voice (see the docs for the exact request schema).

Price$15 per 1M characters

Checked29 September 2026

Where it stands

60newer speech and audio models since its release

The 5 newest are listed. All speech and audio models

After it from xAI
Grok Voice Think Fast 2.029 Jul 2026
Weights
Closed weights; access is hosted only.

How to call it

2 ways to use Grok Text to Speech (Grok TTS API).

Providers, model ids, endpoints and docs for Grok Text to Speech (Grok TTS API)
ProviderModel idEndpointDocs
xAI API (REST) https://api.x.ai/v1/tts docs.x.ai
xAI API (WebSocket streaming) wss://api.x.ai/v1/tts docs.x.ai

Pricing

Prices for Grok Text to Speech (Grok TTS API)
Per 1M characters$15

As published: “USD per 1M characters”.

Source: docs.x.ai, checked 29 September 2026.

Specs

Input
Text
Output
Audio
Context window
Not published
Max output
Not published
Open weights
No
Licence
Proprietary
Released
17 April 2026
Status
Current
Type
Speech and audio

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • Inline speech tags

    Inline tags ([pause], [laugh], [sigh], [cry], [gasp], ...) and wrapping tags (<whisper>, <soft>, <loud>, <slow>, <fast>, <sing>) control delivery.

    Source: docs.x.ai

  • Custom (cloned) voices

    Found after launch

    Clone a voice from a short reference clip via the Custom Voices API; the voice_id works like built-in voices in TTS and the Voice Agent API.

    Source: docs.x.ai

Notes

Launched with the Grok STT API on 2026-04-17 (some press reports an earlier developer opening in March 2026). No separate model id is documented; the endpoint selects the model. 60,000 characters per REST request; ~20 languages plus auto-detect; MP3/WAV/PCM/mu-law/A-law at 8-48 kHz; voice list via GET /v1/tts/voices (Ara, Eve, Leo, Rex, Sal and many more).

Sources: https://docs.x.ai/developers/model-capabilities/audio/text-to-speech · https://x.ai/news/grok-stt-and-tts-apis · https://docs.x.ai/developers/pricing