Grok Voice is the name xAI uses for Grok’s speech features: voice mode in the Grok app, the Grok Voice 3.0 speech-to-speech model, the 28 built-in voices, and the Voice API with text to speech, speech to text and custom voices.

How do I turn on Grok voice mode?

Open the Grok app on iOS or Android (or grok.com), tap the microphone or waveform icon next to the message box, and start talking. The voice can be changed in the app’s voice settings.

Can I use Grok voices outside the app?

Yes, through the Grok Voice API. The text to speech endpoint returns audio in any of the 28 voices for $15 per million characters, and this site lets you try them free without an API key.

Which Grok voice is the default?

In the text to speech API the default is Eve. In the Grok app the default varies by platform and you can switch it in settings; Ara is the voice most people associate with the app.

Grok Voice Explained: App Voice Mode, Voices, API and Pricing

Grok Voice is xAI’s speech stack: the Grok app’s voice mode, the Grok Voice 3.0 speech-to-speech model, 28 voices, and APIs for text to speech, transcription and voice cloning. What each part does and costs.

Last updated: 16 Oct 2026

"Grok Voice" means a few different things depending on who is saying it. This guide sorts them out: the voice mode in the Grok app, the Grok Voice 3.0 model behind it, the 28 voices, and the Grok Voice API that developers use for text to speech, voice agents, transcription and voice cloning.

1. Voice mode in the Grok app

The consumer side. In the Grok app (iOS, Android, grok.com), the microphone or waveform button next to the message box opens a live, spoken conversation. You can interrupt Grok mid-sentence, it responds with tone rather than a flat read, and it can look things up while talking.

Voice mode runs on the Grok Voice 3.0 speech-to-speech model since October 2026. The voice you hear is one of the original Grok voices: Ara, Eve, Leo, Rex or Sal. The app also offers personality presets that change how Grok behaves, separate from which voice speaks.

2. The Grok Voice 3.0 model

The engine. Grok Voice 3.0 is a speech-to-speech model: it takes audio in and produces audio out, with reasoning and tool use in between, instead of chaining transcription, a text model and a text to speech voice. xAI reports it at #1 on the Artificial Analysis Speech-to-Speech Index (86.9) and uses it for Tesla and Starlink support calls. Details and benchmarks are on the Grok Voice 3.0 page.

3. The 28 Grok voices

The sound. The Voice API ships 28 built-in voices; all of them speak all 20 supported languages, and all of them accept speech tags like [pause], [laugh] and <whisper>:

Original five (also in the app): Ara, Eve, Leo, Rex, Sal.
Added with the API: Altair, Atlas, Aurora, Carina, Castor, Celeste, Cosmo, Helios, Helix, Iris, Kepler, Liora, Lumen, Luna, Lux, Naksh, Orion, Perseus, Rigel, Sirius, Ursa, Zagan, Zenith.

Hear any of them with your own text on the voices page or straight from the homepage tool.

4. The Grok Voice API

The developer side, at x.ai/api/voice. Four capabilities:

Capability	What it does	Price
Speech to speech	Real-time voice agents over WebSocket, with tools, search and SIP phone calls	$0.08 / min
Text to speech	`POST /v1/tts`: text in, MP3/WAV/PCM out, 28 voices, speech tags, timestamps	$15 / 1M characters
Speech to text	Transcription of files or live streams, with speaker diarization and entity recognition	$0.10 / hr REST, $0.20 / hr streaming
Custom voices	Clone a voice from about two minutes of audio, then use it in TTS and agents	Create in console; usage billed as TTS

Enterprise notes from xAI's page: SOC 2 Type II, HIPAA-eligible with a BAA, GDPR data-processing agreements, zero-data-retention option, custom rate limits and SSO.

Guides on this site: Grok Voice API: text to speech endpoint, building a Grok voice agent, Grok voice clone, and the pricing calculator.

Which one do you need?

Want to talk to Grok? The app. Nothing to set up.
Want Grok's voices to read your text? Text to speech. Try it free here; in production it is $15 per million characters.
Want a bot that answers calls or talks to users in your app? Speech to speech with Grok Voice 3.0, $0.08 per minute.
Want your own voice (or a brand voice) in any of the above? Custom voices.

About this site

Grok Text to Speech is an independent tool built on the public xAI API so people can try the voices without an account. It is not affiliated with xAI. Facts on this page were checked against xAI's documentation and launch post on 16 October 2026; the official pages win if anything here is out of date.