Developers building voice agents with live web and X search can drop it into OpenAI-style code, though the per-minute price has risen since launch.
Kenning's take
What it does
The Grok Voice Agent API lets developers build voice agents on the same stack that runs Grok Voice in the Grok apps and Tesla cars. Agents speak dozens of languages, call custom tools and can search the web and X in real time. It follows the OpenAI Realtime API format and has a LiveKit plugin.
- Dozens of languages with automatic switching
- Custom tool calling plus web and X search
- Expressive voices including Ara, Eve and Leo
- Compatible with the OpenAI Realtime API spec
- Official LiveKit plugin
Who it suits. Developers building phone, in-car or app voice assistants.
Key facts
- Category
- Developer tools
- Part of
- Grok
- Made by
- xAI (SpaceXAI)
- Based in
- United States
- Released
- 17 December 2025
- How to get it
- self-serve through the xAI API and Console; voice playground in the browser
- Works on
- API
- In the UK
- Yes
- API price
- speech to speech $0.08 per minute; text to speech $15 per million characters; speech to text $0.10 per hour (batch)
Pricing
| Plan | Price | Billed |
|---|---|---|
| Voice API speech to speech | $0.08 | minute |
FAQ
When did the Grok Voice Agent API launch?
xAI launched it on 17 December 2025.
How much does the Grok Voice Agent API cost?
xAI's API pricing lists speech to speech at $0.08 per minute; it launched at $0.05 per minute.
Does it work with OpenAI Realtime API code?
Yes, xAI says it is compatible with the OpenAI Realtime API specification.
Facts from the maker's own pages and the sources listed. Checked 2026-10-11.
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