Grok Voice reaches first audio in 0.70 seconds

xAI’s Grok Voice Think Fast 2.0 reaches first audio in 0.70 seconds and scores 82.9% on Artificial Analysis’ speech-to-speech quality index, according to xAI’s launch benchmarks. The live API pricing page lists the model at $0.08 per audio minute, or $4.80 per hour, and xAI says the grok-voice-latest alias will move to it automatically on August 5. Teams comparing the release with Grok’s broader price-performance strategy should pin the old model now if they need a stable regression baseline; the new endpoint is 60% dearer than Think Fast 1.0 even as latency falls 44%.