GPT Realtime 2.1

gpt-realtime-2.1 · OpenAI

GPT-Realtime-2.1 is a reasoning speech-to-speech model for the Realtime API, with tool use and configurable reasoning effort, improving on GPT-Realtime-2 in alphanumeric recognition, silence and noise handling, and interruption behavior.

API Pricing

Input$4 / 1M tokens
Output$24 / 1M tokens
Cache read$0.4 / 1M tokens

Specifications

Context128K tokens
Modalitiestext, audio, image
CapabilitiesThinking, Tool calling, Audio output

Frequently asked questions

What is GPT Realtime 2.1?

GPT-Realtime-2.1 is a reasoning speech-to-speech model for the Realtime API, with tool use and configurable reasoning effort, improving on GPT-Realtime-2 in alphanumeric recognition, silence and noise handling, and interruption behavior.

What is the context length of GPT Realtime 2.1?

GPT Realtime 2.1 has a 128,000 token context window.

How much does GPT Realtime 2.1 cost?

On AIHubMix, GPT Realtime 2.1 costs $4 per million input tokens and $24 per million output tokens. Cached input reads are billed at $0.4 per million tokens.

What modalities does GPT Realtime 2.1 support?

GPT Realtime 2.1 accepts text, audio and image input.

How do I call GPT Realtime 2.1 via API?

GPT Realtime 2.1 is available through the AIHubMix unified API. The API is OpenAI-compatible: point your OpenAI SDK at https://aihubmix.com/v1, use your AIHubMix API key, and set the model name to gpt-realtime-2.1 — no other code changes needed.

Who created GPT Realtime 2.1?

GPT Realtime 2.1 is developed by OpenAI. AIHubMix aggregates it alongside models from other providers behind one API and one bill.

When was GPT Realtime 2.1 released?

GPT Realtime 2.1 was released on July 6, 2026 by OpenAI.

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Use GPT Realtime 2.1 via the AIHubMix unified API — one interface for every major LLM.