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What is TML-interaction-small?

TML-Interaction-Small is a real-time multimodal interaction model developed by Thinking Machines Lab to enable scalable human-AI collaboration through continuous interaction across audio, video, and text. The model is designed to overcome the limitations of traditional turn-based AI systems by allowing humans and AI to communicate more naturally through simultaneous perception, speech, visual understanding, interruptions, and collaborative reasoning. Instead of relying on external dialog management systems or separate real-time scaffolding, TML-Interaction-Small handles interaction natively through a time-aware architecture built around continuous 200ms micro-turn exchanges. This architecture allows the model to process streaming input and generate output concurrently while maintaining awareness of silence, interruptions, overlap, timing, and visual context. The model is capable of responding proactively to spoken and visual cues, enabling interaction patterns such as live translation, contextual interruptions, visual monitoring, simultaneous speech, live commentary, and continuous conversational collaboration. TML-Interaction-Small also coordinates with an asynchronous background reasoning model that performs deeper reasoning, tool usage, web browsing, and longer-horizon tasks while the interaction layer remains present and responsive throughout the conversation. Thinking Machines Lab designed the system to reduce the collaboration bottleneck in modern AI workflows by enabling humans to stay continuously involved in AI-assisted processes rather than being pushed out by fully autonomous systems. The model uses a multimodal streaming architecture with lightweight audio and visual processing pipelines, encoder-free early fusion techniques, optimized streaming inference infrastructure, and batch-invariant kernels for low-latency performance and training stability.

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.

Media

Media

Integrations Supported

OpenAI
gpt-realtime

Integrations Supported

OpenAI
gpt-realtime

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Pricing Information

$0.40 per cached input
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

Thinking Machines Lab

Company Location

United States

Company Website

thinkingmachines.ai/

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

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

Categories and Features

Categories and Features

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