GPT-Realtime-2.1
Speech and audio
gpt-realtime-2.1
$4 text in, $24 text out per 1M tokens
GPT-Realtime-1.5
Model idgpt-realtime-1.5
Price$4 text in, $16 text out per 1M tokens
Checked29 September 2026
Where it stands
65newer speech and audio models since its release
- NVIDIA Nemotron 3.5 Transcribe (30B-A4B)28 Oct 2026
- Hy-SimulMT-30B-A3B22 Oct 2026
- Eleven Realtime v1 Max / Mini20 Oct 2026
- Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3)20 Oct 2026
- Voxtral Small Transcribe 320 Oct 2026
The 5 newest are listed. All speech and audio models
- Before it from OpenAI
- GPT-Realtime and GPT-Realtime mini28 Aug 2025
- After it from OpenAI
- GPT-Realtime-Whisper7 May 2026
- Weights
- Closed weights; access is hosted only.
How to call it
Where to use GPT-Realtime-1.5, with its model id.
| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenAI API | gpt-realtime-1.5 |
wss://api.openai.com/v1/realtime |
developers.openai.com |
Pricing
| Text input | $4 per 1M tokens |
|---|---|
| Text output | $16 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 |
As published: “per 1M tokens (USD)”.
Source: developers.openai.com, checked 29 September 2026.
Specs
- Input
- Text, audio and images
- Output
- Text and audio
- Context window
- 32,000 tokens
- Max output
- 4,096 tokens
- Open weights
- No
- Licence
- Proprietary
- Training cutoff
- September 2024
- Released
- 23 February 2026
- Status
- Legacy
- Type
- Speech and audio
What stands out
What its maker marketed at launch, and what people found later, each with its source.
Non-reasoning voice agent model
Speech-to-speech model for voice agents and customer support with function calling and prompt caching; cheaper text output ($16 vs $24/1M) than the reasoning gpt-realtime-2.x models.
Notes
Released 2026-02-23 alongside gpt-audio-1.5 (Chat Completions). Docs still call it ‘our flagship audio model for voice agents’, but gpt-realtime-2 (May 2026) and gpt-realtime-2.1 (July 2026) supersede it; not deprecated as of 2026-09-29. It is the named replacement for the gpt-4o-realtime-preview models shut down 2026-05-12.
Sources: