---
id: "2026-07-08-openai-gpt-live-chatgpt-voice"
url: "https://postcutoff.com/e/2026-07-08-openai-gpt-live-chatgpt-voice/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2026-07-08"
date_precision: day
category: model-release
importance: 4
confidence: high
status: [Confirmed]
sources: 8
editor: human editor
human_review: null
version: "2026-10-16"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-07-08-openai-gpt-live-chatgpt-voice/

# OpenAI launches GPT-Live, full-duplex voice models replacing ChatGPT's Advanced Voice Mode

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. They replaced turn-based Advanced Voice Mode in ChatGPT (mini as default for everyone, GPT-Live-1 for paid tiers); the gpt-live-1 API went GA on 2026-09-10 at $0.05 per minute.

## 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 [2026-09-23-chatgpt-voice-plugins-work](https://postcutoff.com/e/2026-09-23-chatgpt-voice-plugins-work/index.md))
- 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 [2026-10-15-openai-gpt-live-1-1-voice-update](https://postcutoff.com/e/2026-10-15-openai-gpt-live-1-1-voice-update/index.md)
- 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.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 69 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): 8 days after its cutoff
- Gemini 4 Hydrogen (training cutoff March 2026): 99 days after its cutoff
- Grok 4.7 (training cutoff May 2026): 38 days after its cutoff

## Sources

1. [OpenAI - Introducing GPT-Live](https://openai.com/index/introducing-gpt-live/) (openai.com, official)
2. [gpt-live-1 model page](https://developers.openai.com/api/docs/models/gpt-live-1) (developers.openai.com, docs)
3. [OpenAI API changelog (GPT-Live 1 GA, 2026-09-10)](https://developers.openai.com/api/docs/changelog) (developers.openai.com, docs)
4. [OpenAI: Build more natural voice experiences with GPT-Live-1 in the API (Sept 10)](https://openai.com/index/introducing-gpt-live-1-in-the-api/) (openai.com, official)
5. [TechCrunch - OpenAI releases new voice models for more natural live conversations](https://techcrunch.com/2026/07/08/openai-releases-new-voice-models-for-more-natural-live-conversations/) (techcrunch.com, press)
6. [Pondero - GPT-Live comes to ChatGPT desktop](https://pondero.ai/news/2026-07-25-gpt-live-chatgpt-desktop/) (pondero.ai, press)
7. [Simon Willison on X - ChatGPT voice mode reports an April 2024 cutoff](https://x.com/simonw/status/2042630738542203057) (x.com, discussion)
8. [Simon Willison - ChatGPT voice mode is a weaker model (2026-04-10)](https://simonwillison.net/2026/apr/10/voice-mode-is-weaker/) (simonwillison.net, discussion)

## Changes

- 2026-10-16: Linked the GPT-Live-1.1 update (Oct 15)
- 2026-09-30: Added the Sept 10 API launch of GPT-Live-1
- 2026-09-29: Added pre-GPT-Live voice-mode knowledge-cutoff note (Willison)
- 2026-09-29: Linked the 2026-09-23 Voice plugins / Voice-in-Work entry
- 2026-09-29 (filed): Created

## Related

- 2026-10-15: [OpenAI ships GPT-Live-1.1](https://postcutoff.com/e/2026-10-15-openai-gpt-live-1-1-voice-update/index.md)
- 2026-09-23: [ChatGPT Voice gets plugins and moves into ChatGPT Work](https://postcutoff.com/e/2026-09-23-chatgpt-voice-plugins-work/index.md)
- 2026-07-09: [OpenAI launches ChatGPT Work, a long-running agent for office work](https://postcutoff.com/e/2026-07-09-chatgpt-work/index.md)
- 2026-05-07: [OpenAI releases GPT-Realtime-2, GPT-Realtime-Translate and GPT-Realtime-Whisper](https://postcutoff.com/e/2026-05-07-openai-gpt-realtime-2-translate-whisper/index.md)
- 2024-05-13: [OpenAI launches GPT-4o, a natively multimodal 'omni' model](https://postcutoff.com/e/2024-05-13-gpt-4o/index.md)
- People: [Simon Willison](https://postcutoff.com/person/simon-willison/)
- Models: [GPT-Live 1](https://postcutoff.com/m/gpt-live-1/) (`gpt-live-1`)
- Archived: 2 videos, listed in https://postcutoff.com/e/2026-07-08-openai-gpt-live-chatgpt-voice/index.json