Artificial Analysis (@ArtificialAnlys) updated its Speech to Speech Index: Google Gemini 3.8 Live Extended Thinking (High) debuts at #1 with 82.6, ahead of GPT-Live-1 (Astra medium) at 81.5 and Grok Voice Think Fast 2.0 High at 81.3; standard Gemini 3.8 Live lands #5 at 76.0. The same drop covers Speech Agent Arena, Tau Voice (Extended Thinking leads at 68.6%), Big Bench Audio, time-to-first-audio, and input-audio cost ($0.84/hr standard, $3.50/hr Extended Thinking).

Key Takeaways

  • ✓Gemini 3.8 Live Extended Thinking (High) leads Speech to Speech Index at 82.6, above GPT-Live-1 Astra at 81.5.
  • ✓On Tau Voice, Extended Thinking leads at 68.6%; standard Gemini 3.8 Live scores 30.1%.
  • ✓Standard input audio is about $0.84/hr (cheapest in the Index); Extended Thinking about $3.50/hr, still below Astra at $5.83.
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Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
On Tau Voice, Extended Thinking leads at 68.6%; standard Gemini 3.8 Live scores 30.1%.
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💰 Cost & PlansCompare
Standard input audio is about $0.84/hr (cheapest in the Index); Extended Thinking about $3.50/hr, still below Astra at $5.83.
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🛠️ Ecosystem & IDERules
Gemini 3.8 Live · Artificial Analysis · Speech to Speech Index
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Up NextArtificial Analysis: GPT-Live-1 (Astra) tops Speech to Speech Index at 81.5
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