Old voice assistants worked like walkie-talkies: you talk, it waits for silence, then it answers. On July 8 OpenAI shipped GPT-Live, a pair of full-duplex voice models that listen and speak at the same time — and it flat-out replaces Advanced Voice Mode.
What actually changed
GPT-Live processes what you’re saying while it’s still talking, making a speak/listen/pause/interrupt decision many times a second. So it can drop a “mhmm” or “yeah” mid-sentence, fire back quick, or just shut up while you think. OpenAI is targeting ~300ms latency, and it’s charging for it: GPT-Live-1 goes to Go/Plus/Pro, GPT-Live-1 mini becomes the default for free users. Latency is now a paid tier.
The clever part: when you ask something that needs web search or real reasoning, it hands the job to GPT-5.5 in the background and folds the answer back in without breaking the flow.
Developer API
Both models are live in the ChatGPT iOS and Android apps globally. The API isn’t open yet — developers join a signup form for access “coming soon.” Obvious use case: voice agents that interrupt and get interrupted like a person, not a phone tree.
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