The new full duplex speech model from OpenAI delegates reasoning and tool use to a backend text model while streaming audio via API. Using Astra at medium reasoning effort, the GPT-Live-1 model achieved 81.5 on the Artificial Analysis Speech to Speech Index, placing it ahead of Grok Voice Think Fast 2.0 High at 81.3. Costs for the model are $4.47 per hour for the Sol backend and $5.83 per hour for Astra, inclusive of session charges and token usage.
Gemini 3.1 Flash Live Minimal leads conversational preference with 1,096 Elo, while GPT-Live-1 Sol ranks third at 1,053. GPT-Live-1 holds the top two spots on the Tau Voice agentic benchmark at 67.9% and 59.3%, though these figures are based on a single trial. Average time to first audio for the model is 1.24 to 1.34 seconds, compared with 0.70 seconds for Grok.
Key sources
- SOURCE@artificialanlys“GPT-Live-1 (Astra, medium) achieves 81.5, ranking #1, while GPT-Live-1 (Sol, low) scores 80.1, ranking #3”x.com
- SUPPORT@openaidevs“OpenAI’s GPT-Live-1 debuts at #1 on the Artificial Analysis Speech to Speech Index at a score of 81.5”x.com
- SUPPORT@artificialanlys“GPT-Live-1 (Astra, medium) leads Tau Voice at 67.9%, followed by GPT-Live-1 (Sol, low) at 59.3%”x.com
- SUPPORT@artificialanlys“Grok Voice Think Fast 2.0 High leads task success at 94.6% with 1,011 Elo”x.com
- SUPPORT@artificialanlys“GPT-Live-1 (Astra, medium) costs $5.83 and GPT-Live-1 (Sol, low) costs $4.47 per hour of input audio”x.com
- SOURCEmarketbrief.now