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Description

GPT-Realtime-2.1 is an OpenAI realtime model designed for advanced voice-agent and speech-to-speech AI applications. It improves on GPT-Realtime-2 with stronger alphanumeric recognition, better silence and noise handling, and more natural interruption behavior. The model supports text, audio, and image inputs, while producing text and audio outputs for interactive realtime experiences. Developers can use GPT-Realtime-2.1 across endpoints such as Chat Completions, Responses, Realtime, realtime translation, realtime transcription sessions, and related OpenAI API workflows. The model supports function calling, configurable reasoning effort, instruction following, and reasoning token support for complex voice-agent tasks. Its 128,000-token context window and 32,000-token maximum output make it suitable for longer conversations and more detailed realtime workflows. GPT-Realtime-2.1 does not support video, structured outputs, fine-tuning, or predicted outputs according to OpenAI’s current documentation. Pricing starts at $4 per 1 million text input tokens and $24 per 1 million text output tokens, with separate pricing for audio and image tokens. By combining realtime audio interaction, reasoning, tool use, and multimodal input, GPT-Realtime-2.1 helps developers build responsive AI agents for support, sales, operations, translation, transcription, and interactive voice applications.

Description

TML-Interaction-Small is a multimodal interaction model created by Thinking Machines Lab that enables continuous real-time collaboration between humans and AI across audio, video, and text modalities. The model is designed to move beyond traditional turn-based AI systems by supporting native interaction capabilities such as simultaneous listening and speaking, proactive interjections, visual cue awareness, real-time responses, and ongoing contextual collaboration. TML-Interaction-Small processes interactions through a time-aligned micro-turn architecture that continuously exchanges 200ms streams of input and output, allowing the model to maintain conversational presence while reasoning, responding, and acting concurrently. The system combines an interaction model with an asynchronous background model that handles deeper reasoning, tool usage, browsing, and long-running workflows while the primary interaction layer continues communicating with the user in real time. The architecture allows users to collaborate with AI more naturally through speech, video, messaging, and multimodal inputs without waiting for rigid conversational turn boundaries. Thinking Machines Lab developed the model to improve human-AI collaboration by keeping people actively involved during AI workflows rather than relying solely on autonomous agents. TML-Interaction-Small includes capabilities such as live translation, contextual interruptions, visual-based reactions, concurrent speech processing, time awareness, tool calling, web browsing, and multimodal streaming interaction. The system also introduces encoder-free early fusion techniques, streaming inference optimization, and reinforcement learning strategies optimized for interactive responsiveness and stability.

API Access

Has API

API Access

Has API

Screenshots View All

Screenshots View All

Integrations

OpenAI
gpt-realtime

Integrations

OpenAI
gpt-realtime

Pricing Details

$0.40 per cached input
Free Trial
Free Version

Pricing Details

No price information available.
Free Trial
Free Version

Deployment

Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook

Deployment

Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook

Customer Support

Business Hours
Live Rep (24/7)
Online Support

Customer Support

Business Hours
Live Rep (24/7)
Online Support

Types of Training

Training Docs
Webinars
Live Training (Online)
In Person

Types of Training

Training Docs
Webinars
Live Training (Online)
In Person

Vendor Details

Company Name

OpenAI

Founded

2015

Country

United States

Website

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

Vendor Details

Company Name

Thinking Machines Lab

Country

United States

Website

thinkingmachines.ai/

Product Features

Product Features

Alternatives

Alternatives