Superseded by 2.0, which is now the default, so only teams that pinned this version need care.
Kenning's take
What it does
Grok Voice Think Fast 1.0 is a speech model for voice agents that handle multi-step tasks such as support calls, phone sales and bookings. It reasons in the background without slowing replies, handles heavy tool use and reads back details like addresses. It is available through the xAI Voice API, and was succeeded by version 2.0 in July 2026.
- Background reasoning with no added latency
- High-volume tool calling
- Collects and reads back emails, addresses and numbers
- 25+ languages
- Built for noisy telephony audio
Who it suits. Teams building customer support and sales voice agents.
Key facts
- Category
- AI models
- Part of
- Grok
- Made by
- xAI (SpaceXAI)
- Based in
- United States
- Released
- 23 April 2026
- How to get it
- xAI API as grok-voice-think-fast-1.0 (must be pinned; grok-voice-latest moved to 2.0 on 2026-08-05)
- Works on
- API
- In the UK
- Yes
Pricing
| Plan | Price | Billed |
|---|---|---|
| Voice API speech to speech | $0.08 | minute |
FAQ
When was Grok Voice Think Fast 1.0 released?
xAI announced it on 23 April 2026.
Is Grok Voice Think Fast 1.0 still available?
xAI says it can be pinned as grok-voice-think-fast-1.0; the default moved to 2.0 on 5 August 2026.
What is it for?
Voice agents for customer support, sales and bookings that need tool calls and accurate data entry.
Facts from the maker's own pages and the sources listed. Checked 2026-10-11.
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