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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).

Artificial Analysis (@ArtificialAnlys) published its Speech to Speech Index: OpenAI GPT-Live-1 with Astra (medium) as the delegated backend debuts at #1 with 81.5, while Sol (low) scores 80.1 at #3, with Grok Voice Think Fast 2.0 High between them at 81.3. GPT-Live-1 is a full-duplex speech model that can delegate reasoning and tool use to a backend text model mid-conversation. The same drop covers Speech Agent Arena, Tau Voice, Big Bench Audio, plus cost and time-to-first-audio.