SpaceXAI said Grok Voice Think Fast 2.0 is #1 on the Artificial Analysis Speech-to-Speech Index, which scores whether voice agents can reason over speech, resolve real customer issues, and complete tasks with tools. The model is available via API and Agent Builder. SpaceXAI said Starlink is already using Grok Voice to handle more than 15,000 inbound support and sales calls a day.

Key Takeaways

  • ✓Think Fast 2.0 is scored on reasoning, issue resolution, and tool use—not just spoken fluency.
  • ✓The model is live in the API and Agent Builder for teams building voice agents.
  • ✓Starlink’s 15,000 daily calls are a production proof point for voice LLMs in support.
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Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
Think Fast 2.0 is scored on reasoning, issue resolution, and tool use—not just spoken fluency.
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Grok 4.6 · in: $2 / out: $6
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🛠️ Ecosystem & IDERules
Grok voice · Think fast 2 · Speech to speech
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