The current default for xAI voice agents, with quicker tool calls than 1.0 at the same 8 cents a minute.
Kenning's take
What it does
Grok Voice Think Fast 2.0 is xAI's speech-to-speech model for voice agents. Compared with 1.0 it transcribes more accurately, uses fewer reasoning tokens so tool calls happen sooner, and speaks in shorter turns. Developers use it through the xAI Voice API, where it became the default grok-voice-latest model on 5 August 2026.
- Reasons in parallel with speech
- Improved transcription in 24 languages
- Faster tool calls
- Trained for shorter, one-question-at-a-time replies
- Drop-in upgrade from 1.0
Who it suits. Developers running voice agents for support, sales and phone workflows.
Key facts
- Category
- AI models
- Part of
- Grok
- Made by
- xAI (SpaceXAI)
- Based in
- United States
- Released
- 29 July 2026
- How to get it
- xAI API as grok-voice-think-fast-2.0 (default for grok-voice-latest from 2026-08-05)
- Works on
- API
- In the UK
- Yes
- API price
- $0.08 per minute of audio
Pricing
| Plan | Price | Billed |
|---|---|---|
| API | $0.08 | minute of audio |
FAQ
When was Grok Voice Think Fast 2.0 released?
xAI announced it on 29 July 2026.
How much does Grok Voice Think Fast 2.0 cost?
$0.08 per minute of audio.
How is it different from 1.0?
xAI says it transcribes more accurately, uses fewer reasoning tokens and calls tools faster.
Facts from the maker's own pages and the sources listed. Checked 2026-10-11.
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