xAI's Grok Voice 3.0 Dominates Speech-to-Speech Benchmark, Claiming Top Spot Over OpenAI and Google

xAI released Grok Voice 3.0, a frontier speech-to-speech model that tops Artificial Analysis's Speech-to-Speech Index with a score of 86.9, outpacing OpenAI's GPT-Live-1 at 83.2 and Google's Gemini 3.8 Live at 82.6. The model, launched October 14, 2026, is priced identically to its predecessor at $0.08 per minute, or $4.80 per hour, making it one of the few frontier voice models to maintain cost parity while improving performance.