
GPT-Live-1 in the API: Build Natural Full-Duplex Voice Agents (What Changed)
OpenAI put GPT-Live-1 in the API on Sep 10, 2026 - a full-duplex voice layer at $0.05/min billed per second. Covers architecture vs STT-LLM-TTS, backend pairing, free tier unsupported, and when to keep Vapi or LiveKit.
- AI Agents
- Development