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-realtime-2-1/

# GPT-Realtime-2.1

OpenAI, GPT Realtime family. Status: current. Type: speech and audio. Released: 2026-07-06. Training cutoff: 2024-09.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenAI API | `gpt-realtime-2.1` | wss://api.openai.com/v1/realtime | https://developers.openai.com/api/docs/models/gpt-realtime-2.1 |
| Azure OpenAI (Microsoft Foundry) | `gpt-realtime-2.1` |  | https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure |

## Pricing

- Text input: $4 per 1M tokens
- Text output: $24 per 1M tokens
- Audio input: $32 per 1M tokens
- Audio output: $64 per 1M tokens
- Cached input: $0.40 per 1M tokens
- Image input: $5 per 1M tokens
- Unit as published: per 1M tokens (USD)
- Source: https://developers.openai.com/api/docs/pricing
- Last checked: 2026-09-29

## Specs

- Input: text, audio, image
- Output: text, audio
- Context window: 128,000 tokens
- Max output: 32,000 tokens
- Open weights: no
- Licence: proprietary

## Where it stands

- Newer speech and audio models in the registry since its release: 48. 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 (2026-05-07) https://postcutoff.com/m/gpt-realtime-2/
- After it from OpenAI: GPT-Live 1 (2026-07-08) https://postcutoff.com/m/gpt-live-1/
- Closed weights; access is hosted only.

## What stands out

- Reasoning in realtime voice: Configurable reasoning effort in a speech-to-speech model (at a latency cost). Source: https://developers.openai.com/api/docs/models/gpt-realtime-2.1
- Robust turn-taking: Improved alphanumeric recognition, silence/noise handling and interruption behavior. Source: https://developers.openai.com/api/docs/models/gpt-realtime-2.1

## Notes

Realtime API only. Successor to gpt-realtime-2 (2026-05-07, same prices, see gpt-realtime-2.md). Mini variant gpt-realtime-2.1-mini (audio $10/$20, text $0.60/$2.40). Replaces gpt-realtime / gpt-4o-realtime (shutdown Jan 20 2027). Azure version 2026-07-07.

Low-latency voice agents over WebRTC/WebSocket (`/v1/realtime?model=gpt-realtime-2.1`).

Sources:
- https://developers.openai.com/api/docs/models/gpt-realtime-2.1
- https://developers.openai.com/api/docs/pricing
- https://developers.openai.com/api/docs/changelog
- https://developers.openai.com/api/docs/deprecations
- Models overview: https://developers.openai.com/api/docs/models

Model page: https://postcutoff.com/m/gpt-realtime-2-1/