Elon Musk’s xAI secured the top position on the Artificial Analysis Speech-to-Speech Index with Grok Voice Think Fast 2.0, launched on July 29, 2026, achieving an overall score of 79.0%. The model excels with 97% in speech reasoning and 94.7% in task success rates, alongside a time-to-first-audio of 0.70 seconds. Its agentic performance score reached 56.5%, measuring the ability to handle multi-step tasks, while using roughly 60% fewer reasoning tokens than its predecessor. xAI prices the service at $0.08 per minute of audio, making a ten-minute customer service call cost just $0.80 in AI expenses.
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