xAI rolls out Grok Voice Think Fast 2.0 speech-to-speech model
xAI
xAI released Grok Voice Think Fast 2.0, its latest speech-to-speech voice model, with grok-voice-latest automatically routing to it starting August 5, 2026. The company reports 1.4x faster response and roughly 2x transcription accuracy gains over the prior version, with time-to-first-audio dropping from 1.25s to 0.70s.
Why it matters
Faster, more accurate real-time voice models are a key building block for xAI's push into voice assistants and Grok's expansion across Tesla and mobile apps.
Importance: 2/5
Notable incremental update to a production voice model with concrete latency/accuracy gains.