xAI's Grok Voice 3.0 Achieves Top Ranking in Speech-to-Speech AI Benchmark

xAI announced Grok Voice 3.0 on October 14, 2026, a speech-to-speech conversational voice AI system that ranks first on the Artificial Analysis Speech-to-Speech Index with a composite score of 86.9, surpassing OpenAI's GPT-Live-1 and Google's Gemini 3.8 Live. The system is now available through xAI's Voice Agent API at the same price as its predecessor: $0.08 per minute ($4.80 per hour) plus $0.004 per text input.