OpenAI launches GPT-Live, full-duplex voice models replacing ChatGPT’s Advanced Voice Mode
Confirmed
Importance: major (4 of 5)The takeaway
On 2026-07-08 OpenAI released GPT-Live-1 and GPT-Live-1 mini, full-duplex voice models that listen and speak at the same time, backchannel (“mhmm”) and hand hard questions to GPT-5.5 in the background without pausing the conversation.
Status
- Claim
Confirmed
- Our reporting
- High confidence
- Importance
- Major (4 of 5)
- Last verified
- 16 October 2026
Your AI and this story
- GPT-6 Astra69 days after its cutoff
- Claude Opus 5.58 days after its cutoff
- Gemini 4 Hydrogen99 days after its cutoff
- Grok 4.738 days after its cutoff
None of these four assistants can know about it. The closest, Claude Opus 5.5, stops 8 days before it.
Key facts
- GPT-Live-1 default for ChatGPT Go/Plus/Pro; GPT-Live-1 mini default for Free users; iOS, Android and web
- Full-duplex: can be interrupted naturally, gives backchannels, stays quiet while the user thinks
- Delegates search, reasoning and agentic tasks to GPT-5.5 while the conversation continues
- OpenAI says 150M+ people use ChatGPT voice features (TechCrunch)
- ChatGPT desktop (macOS/Windows) got GPT-Live around 2026-07-23; voice plugins (email, calendar, Slack) followed 2026-09-23, together with Voice inside ChatGPT Work (press; see ChatGPT Voice gets plugins and moves into ChatGPT Work)
- API: gpt-live-1 on new v1/live/sessions endpoint, GA 2026-09-10, $0.05/min billed per second plus backend model
- Before GPT-Live, ChatGPT voice mode ran on a GPT-4o-era model: on 2026-04-10 Simon Willison noted it reported an April 2024 knowledge cutoff, so text and voice in the same subscription had different knowledge (see docs/cutoff-blindness case 017)
- Oct 15, 2026: succeeded in ChatGPT, Codex and dots by GPT-Live-1.1 (new voices in six languages, better accents; API coming soon), see OpenAI ships GPT-Live-1.1
Show 1 more
- Sept 10, 2026: GPT-Live-1 launched in the API: full-duplex interruption handling in one model (no STT-LLM-TTS chain), delegation of reasoning and tool calls to a backend text model such as GPT-6 Astra or a third-party model, style control via system prompt, background-noise and silence handling, long-session reliability, and telephony support; Speak reported almost 80% fewer interruptions of learners vs. its previous turn-based setup
What happened
OpenAI replaced the voice stack in ChatGPT with a new model family built for simultaneous listening and speaking. Instead of waiting for the user to finish a turn, GPT-Live tracks the conversation continuously and offloads heavy reasoning or tool use to a text model (GPT-5.5 at launch) while it keeps talking.
Why it matters
ChatGPT’s default voice experience moved to a full-duplex model with a separate “thinker” behind it, narrowing the gap between natural conversation and capable agents for one of the largest voice-assistant user bases. Rivals followed: Anthropic moved Claude’s voice mode to Opus/Sonnet (2026-07-23) and Google shipped Gemini 3.8 Live (2026-09-15).
OpenAI’s own post could not be fetched by our tools; details are from TechCrunch and the API docs.
Sources
8 sources from 6 sites. Numbers match the chips in the text.
8 sources: 4 primary, 2 press, 2 reactions
Primary
- OpenAI - Introducing GPT-Liveopenai.com, official
- gpt-live-1 model pagedevelopers.openai.com, docs
- OpenAI API changelog (GPT-Live 1 GA, 2026-09-10)developers.openai.com, docs
- OpenAI: Build more natural voice experiences with GPT-Live-1 in the API (Sept 10)openai.com, official
Press
- TechCrunch - OpenAI releases new voice models for more natural live conversationstechcrunch.com, press
- Pondero - GPT-Live comes to ChatGPT desktoppondero.ai, press
Reactions
- Simon Willison on X - ChatGPT voice mode reports an April 2024 cutoffx.com, discussion
- Simon Willison - ChatGPT voice mode is a weaker model (2026-04-10)simonwillison.net, discussion
Changes
- Linked the GPT-Live-1.1 update (Oct 15)
- Added the Sept 10 API launch of GPT-Live-1
- Added pre-GPT-Live voice-mode knowledge-cutoff note (Willison)
- Linked the 2026-09-23 Voice plugins / Voice-in-Work entry
- Filed
