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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 Eleven Realtime?

Eleven Realtime presents a speech-to-speech API that is designed specifically for developers, allowing them to incorporate live voice interactions into their applications and AI agents. This cutting-edge service combines speech recognition, turn-taking features, language-model logic, and voice synthesis while offering both Mini and Max model variations to suit different conversational needs. Developers can easily utilize these models via the Realtime API or through ElevenAgents, ensuring smooth integration into their systems. The streaming interface is meticulously designed to improve interactive voice experiences across a range of applications, including virtual assistants, customer support platforms, educational tutors, and engaging characters. Customization options for agent configurations permit adjustments to prompts, voices, tools, knowledge bases, and conversational flows, providing remarkable flexibility. Moreover, the usage of Realtime is billed on a per-minute basis, with additional charges for model input and output tokens. This product is tailored for developers and organizations that prioritize real-time conversational experiences and voice-driven customer interactions, significantly boosting user engagement and satisfaction levels. With its extensive capabilities, Eleven Realtime stands out as an essential tool for contemporary application development, proving to be an asset for those aiming to innovate in the field of interactive voice technology.

Media

Media

Integrations Supported

OpenAI
gpt-realtime

Integrations Supported

OpenAI
ElevenLabs

API Availability

Has API

API Availability

Has API

Pricing Information

$0.40 per cached input
Free Trial Offered?

Pricing Information

Realtime agents are billed at the standard ElevenAgents per-minute rate plus input, cached-input, and output-token charges for the selected model. Eleven Realtime v1 Max costs more per token than Mini; rates vary by plan and model.

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

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

ElevenLabs

Date Founded

2022

Company Location

United States

Company Website

elevenlabs.io/realtime

Categories and Features

AI Models

Not specified

Categories and Features

AI Voice Models

Not specified

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