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xAI Docs

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xAI Docs

July 29, 2026 at 6:17 PM UTC

grok-voice-think-fast-2.0 is available as the recommended flagship Speech to Speech model. grok-voice-think-fast-1.0 is documented as the previous-generation model.

Changelog

Speech to Speech / Voice

  • grok-voice-think-fast-2.0 is available as the recommended flagship Speech to Speech model. grok-voice-think-fast-1.0 is documented as the previous-generation model.
  • grok-voice-latest is documented as currently aliasing grok-voice-think-fast-1.0, and will route to grok-voice-think-fast-2.0 starting August 5, 2026.
  • Model lists, best-practices guidance, and Voice REST API reference updated for the new model ID (including session model options).
  • reasoning.effort docs no longer limit support to specific voice model IDs.
  • Section titles renamed from “Speech to Speech API” to “Speech to Speech” on related docs pages.
  • See also the announcement and Speech to Speech docs.

Release notes

  • Added a July entry for Grok Voice Think Fast 2.0 availability and the grok-voice-latest routing date above.

Pages: none added or removed.

Older release← Jul 28, 16:17 UTCNewer release→ Jul 30, 12:17 UTC
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