OpenAI's GPT-Live-1 tops Speech Index at 81.5 with delegated backend reasoning
ArtificialAnlys · x · 2026-09-15
OpenAI launched GPT-Live-1, a full-duplex speech-to-speech model that debuts #1 on the Artificial Analysis Speech to Speech Index at 81.5, ahead of Grok Voice Think Fast 2.0 (81.3).
Key points:
- Novel architecture: while the conversation continues, reasoning and tool use are delegated to a separately configured backend text model (Astra or Sol); developers stream audio in and get speech back via API.
- Agentic performance: #1 on Tau Voice at 67.9% (Astra config), vs 56.5% for Grok.
- Preference & task success: #3 and #4 on Speech Agent Arena (1,053/1,048 Elo); Grok leads task success (94.6%), Gemini 3.1 Flash Live Minimal leads preference (1,096 Elo).
- Speed & cost: 1.24–1.34s to first audio (Grok fastest at 0.70s); $4.47–5.83 per hour of input audio, cheaper than GPT-Realtime-2.1 ($10.75), slightly above Grok ($4.80).
Related event: OpenAI's GPT-Live-1 Tops Artificial Analysis Speech-to-Speech Index at 81.5(6 posts)→
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