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Simon Willison used GPT-6 Astra to build a browser-based interface for Google's new Gemini 3.8 Live speech models, which work similarly to OpenAI's GPT-Live. The tool lets you pick a model and voice, add a system prompt, and have real-time voice conversations with interrupt capability.
- Google released Gemini 3.8 Live and 3.8 Live Extended Thinking, speech-to-speech models that parallel OpenAI's GPT-Live family
- The web UI uses only native Web APIs — no external libraries — connecting directly to Google's WebSocket endpoint with Web Audio API for mic and speaker handling
- The implementation demonstrates practical use of Google's Gemini Live WebSocket API for building interactive voice applications