xAI Flips grok-voice-latest to Think Fast 2.0 Today, Cutting First-Audio Latency to 0.70s at $0.08/Minute
xAI·medium signal
As of August 5, 2026 the grok-voice-latest alias automatically moves from Grok Voice Think Fast 1.0 to 2.0 — meaning anyone pinned to the alias gets a silent model swap today. Think Fast 2.0 scores 82.9% on Artificial Analysis' speech-to-speech benchmark versus 75.7% for 1.0, GPT-Realtime-2.1 at 79.1%, and Gemini 3.1 Flash at 69.5%, and reduces first-audio response from 1.25s to roughly 0.70s while cutting median reasoning-token use to 0.4x baseline. Pricing is $0.08 per minute of audio; the model reasons in parallel with speech so tool calls typically fire before the first sentence finishes.