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/m/gpt-live-1/

# GPT-Live 1

OpenAI, GPT Live family. Status: current. Type: speech and audio. Released: 2026-07-08. Training cutoff: 2025-07.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenAI API | `gpt-live-1` | https://api.openai.com/v1/live/sessions | https://developers.openai.com/api/docs/models/gpt-live-1 |
| Web app |  |  | https://chatgpt.com |

## Pricing

- Per minute: $0.05
- Unit as published: per minute of voice session (billed per second); backend model and tools billed separately
- Source: https://developers.openai.com/api/docs/models/gpt-live-1
- Last checked: 2026-10-16

## Specs

- Input: audio, text
- Output: audio, text
- Context window: not published
- Max output: not published
- Open weights: no
- Licence: proprietary

## Where it stands

- Newer speech and audio models in the registry since its release: 45. The 5 newest:
  - NVIDIA Nemotron 3.5 Transcribe (30B-A4B) (2026-10-28) https://postcutoff.com/m/nemotron-3-5-transcribe/
  - Hy-SimulMT-30B-A3B (2026-10-22) https://postcutoff.com/m/hy-simulmt-30b-a3b/
  - Eleven Realtime v1 Max / Mini (2026-10-20) https://postcutoff.com/m/eleven-realtime-v1-max/
  - Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3) (2026-10-20) https://postcutoff.com/m/voxtral-mini-transcribe-3/
  - Voxtral Small Transcribe 3 (2026-10-20) https://postcutoff.com/m/voxtral-small-transcribe-3/
- Before it from OpenAI: GPT-Realtime-2.1 (2026-07-06) https://postcutoff.com/m/gpt-realtime-2-1/
- After it from OpenAI: GPT-Transcribe (2026-07-28) https://postcutoff.com/m/gpt-transcribe/
- Closed weights; access is hosted only.

## What stands out

- Full-duplex voice: Listens and speaks at the same time, delegating reasoning and tool use to a backend agent model. Source: https://developers.openai.com/api/docs/models/gpt-live-1
- New Live API: Served on a dedicated v1/live/sessions endpoint rather than Realtime. Source: https://developers.openai.com/api/docs/models/gpt-live-1
- Replaced turn-based Advanced Voice Mode in ChatGPT: Since 2026-07-08 GPT-Live-1 (paid tiers) and GPT-Live-1 mini (default, all users) power ChatGPT Voice, with backchannels ('mhmm') and background hand-off of hard questions to GPT-5.5. Source: https://techcrunch.com/2026/07/08/openai-releases-new-voice-models-for-more-natural-live-conversations/

## Notes

Launched in ChatGPT 2026-07-08 (GPT-Live-1 for Go/Plus/Pro, GPT-Live-1 mini default for Free); ChatGPT desktop (macOS/Windows) ~2026-07-23; API GA 2026-09-10 per changelog (earlier preview around 2026-07-31). gpt-live-1-mini is ChatGPT-only: not in the API models catalog and developers.openai.com/api/docs/models/gpt-live-1-mini returns 404 (checked 2026-09-29). ChatGPT Voice limits (Unite.AI, 2026-09-23): Free limited mini, Go 3 h mini, Plus 3 h GPT-Live-1, Pro $100 15 h, Pro $200 unlimited; Enterprise/Edu 1.25 credits/min or $0.05/min. Since 2026-09-23 Voice can use plugins/connected apps and runs inside ChatGPT Work. Knowledge cutoff 2025-07-31. Concurrency 25-500 sessions by tier. No image/video input. Not listed on Azure or OpenRouter. Since 2026-10-15 ChatGPT Voice is moving to GPT-Live-1.1 (and GPT-Live-1.1 Quip in place of GPT-Live-1 mini), rolling out gradually; gpt-live-1 remains the API model until GPT-Live-1.1 reaches the API ("coming soon", checked 2026-10-16). OpenAI's launch post returned 403 to our fetcher; ChatGPT facts from TechCrunch.

Natural full-duplex voice assistants that hand hard work to a text model (e.g. gpt-6-sol).

Sources:
- https://developers.openai.com/api/docs/models/gpt-live-1
- https://developers.openai.com/api/docs/changelog
- https://www.unite.ai/openai-brings-plugins-to-live-voice-and-voice-to-work-in-chatgpt/
- https://openai.com/index/introducing-gpt-live/
- https://techcrunch.com/2026/07/08/openai-releases-new-voice-models-for-more-natural-live-conversations/
- Models overview: https://developers.openai.com/api/docs/models
- GPT-Live-1.1 announcement (2026-10-15): https://x.com/OpenAI/status/2110797830361436604

Model page: https://postcutoff.com/m/gpt-live-1/