GPT-Realtime-2.1
Summary
GPT-Realtime-2.1 is a proprietary language model from OpenAI, released on 6 Jul 2026. It accepts text, audio and images and generates text and audio, with a 128K-token context window and up to 32K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $4 per million input tokens and $24 per million output tokens (OpenAI API), across 2 providers we track.
Realtime speech-to-speech model with configurable reasoning, tool use, and robust voice-agent behavior
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | OpenAI |
|---|---|
| Release date | 6 Jul 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 128K (128,000 tokens) [models.dev] |
| Max output | 32K tokens [models.dev] |
| Knowledge cutoff | 30 Sept 2024 [models.dev] |
| Input | Text, audio and images [models.dev] |
| Output | Text and audio [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | No [models.dev] |
GPT-Realtime-2.1 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenAI API gpt-realtime-2.1 | $4 | $24 | $0.40 | 128K | models.dev, 4 Oct 2026 |
| Vercel AI Gateway openai/gpt-realtime-2.1 | $4 | $24 | $0.40 | 128K | models.dev, 4 Oct 2026 |
Frequently asked questions
What is the context window of GPT-Realtime-2.1?
GPT-Realtime-2.1 has a context window of 128,000 tokens (128K) and can generate up to 32,000 tokens in a single response, according to models.dev.
How much does the GPT-Realtime-2.1 API cost?
Through OpenAI API, GPT-Realtime-2.1 costs $4 per million input tokens and $24 per million output tokens. Prices last verified 4 Oct 2026.
Is GPT-Realtime-2.1 open source?
No. GPT-Realtime-2.1 is a proprietary model; OpenAI has not released its weights. It is available through APIs including OpenAI API, Vercel AI Gateway.
When was GPT-Realtime-2.1 released?
OpenAI released GPT-Realtime-2.1 on 6 Jul 2026, according to models.dev.
Which providers offer GPT-Realtime-2.1?
We track GPT-Realtime-2.1 on 2 providers: OpenAI API, Vercel AI Gateway.
Change history
No changes detected since we started tracking this model. We re-check every source daily.