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features
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support

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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

Twigg is an innovative tool for managing context that enhances long-term interactions with large language models by transforming traditional linear chat threads into a visually branching tree of conversation nodes, empowering users to dictate the context provided to the model. Users can easily explore different conversation paths by generating new branches from any node, and they can optimize their prompts by cutting, copying, deleting, or relocating content, which effectively boosts performance while simplifying complexity. The tool features a user-friendly dashboard that monitors token usage for each model and provides clear insights into credit consumption. By allowing control of context at the node level, Twigg minimizes unnecessary token usage and facilitates the concurrent development of ideas, all without overwhelming the primary workflow. It is compatible with leading models through a Bring Your Own Key (BYOK) system and is tailored for projects requiring extended engagement, positioning itself as the “Git for LLMs” by enabling version control, branching, and meticulous context management for conversational AI tasks. As a result, Twigg not only enhances the efficiency of interactions but also empowers users to refine their conversational strategies more effectively.

API Access

Has API Yes 

API Access

Has API Yes 

Screenshots View All

Screenshots View All

Integrations

ChatGPT No 
Claude Fable 5 No 
Claude Fable 5.1 No 
Claude Fable 5.5 No 
Claude Mythos 5 No 
Claude Mythos 5.1 No 
Claude Opus 4.1 No 
Claude Opus 4.5 No 
Claude Opus 4.6 No 
Claude Opus 4.7 No 
Claude Opus 4.8 No 
Claude Opus 5 No 
Claude Opus 5.5 No 
Claude Sonnet 5.5 No 
GPT-5 mini No 
Gemini 2.0 Flash No 
OpenAI Yes 
gpt-realtime Yes 

Integrations

ChatGPT Yes 
Claude Fable 5 Yes 
Claude Fable 5.1 Yes 
Claude Fable 5.5 Yes 
Claude Mythos 5 Yes 
Claude Mythos 5.1 Yes 
Claude Opus 4.1 Yes 
Claude Opus 4.5 Yes 
Claude Opus 4.6 Yes 
Claude Opus 4.7 Yes 
Claude Opus 4.8 Yes 
Claude Opus 5 Yes 
Claude Opus 5.5 Yes 
Claude Sonnet 5.5 Yes 
GPT-5 mini Yes 
Gemini 2.0 Flash Yes 
OpenAI No 
gpt-realtime No 

Pricing Details

$0.40 per cached input
Free Trial Yes 
Free Version No 

Pricing Details

$6.66 per month
Free Trial No 
Free Version No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

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

Twigg

Founded

2025

Country

United States

Website

twigg.ai/

Product Features

Product Features

Alternatives

Alternatives