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What is GPT-Realtime-2.1?

GPT-Realtime-2.1 is an OpenAI realtime reasoning model for developers building voice agents, conversational AI assistants, and speech-to-speech applications. The model is designed to support fast interactive experiences where users can speak naturally and receive audio or text responses. GPT-Realtime-2.1 updates GPT-Realtime-2 with improved handling of alphanumeric recognition, silence, background noise, and interruptions. It supports text, audio, and image input, with text and audio output, while video is not supported. The model includes configurable reasoning effort so developers can balance reasoning depth, latency, and token usage for different voice-agent workflows. GPT-Realtime-2.1 also supports instruction following, function calling, tool use, and reasoning tokens for more complex applications. Its 128,000-token context window and 32,000-token maximum output allow it to manage longer conversations and richer task context. OpenAI lists support across endpoints such as Chat Completions, Responses, Realtime, realtime translations, realtime transcription sessions, Assistants, Batch, and related API services. The model’s documented pricing includes $4 per 1 million text input tokens, $0.40 per 1 million cached text input tokens, and $24 per 1 million text output tokens, with separate audio and image token pricing. GPT-Realtime-2.1 is not documented as supporting streaming, structured outputs, fine-tuning, or predicted outputs. By combining realtime speech, multimodal input, reasoning, function calling, and tool use, GPT-Realtime-2.1 gives developers a foundation for building sophisticated AI voice agents and interactive customer-facing applications.

What is GPT-Realtime-2?

OpenAI has unveiled GPT-Realtime-2, an innovative voice model tailored for engaging live interactions that enables a fluid flow of conversation as it processes requests, utilizes various tools, corrects errors, or navigates interruptions, all while delivering prompt and pertinent replies. This model is purposefully developed for a modern era of voice applications that seek to provide a more intuitive user experience, exhibit higher intelligence in responses, and execute tasks with immediacy. By integrating reasoning capabilities akin to GPT-5 into voice interactions, GPT-Realtime-2 significantly enhances agents' proficiency in understanding user intent, sustaining context, adjusting to shifting requests, and employing tools seamlessly without breaking conversational flow. Moreover, developers can incorporate concise preambles like “let me check that” to indicate to users that the agent is actively processing their question, while the model can manage multiple tools concurrently and clarify its actions through expressions such as “checking your calendar” or “looking that up now.” The model further features advanced recovery strategies, improved context retention for agent-led tasks, and a refined ability to remember specific terminology, all of which contribute to a richer communication experience. In summary, GPT-Realtime-2 is poised to transform the landscape of voice interactions, setting a new standard for more fluid and productive dialogues between users and agents. With these advancements, users can expect a more engaging and responsive interaction that anticipates their needs effectively.

Media

Media

Integrations Supported

OpenAI
gpt-realtime

Integrations Supported

OpenAI
gpt-realtime

API Availability

Has API

API Availability

Has API

Pricing Information

$0.40 per cached input
Free Version
Free Trial Offered?

Pricing Information

$32 per 1M tokens
$32 / 1M audio input tokens ($0.40 for cached input tokens) and $64 / 1M audio output tokens
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

developers.openai.com/api/docs/models/gpt-realtime-2.1

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com/index/advancing-voice-intelligence-with-new-models-in-the-api/

Categories and Features

Categories and Features

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