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features
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support

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Description

Dessa is an innovative speech-to-speech AI model developed by Block, specifically designed for exploring conversational voice technologies and their various applications. This model uniquely processes audio inputs and generates audio outputs directly, bypassing the need for an intermediary text conversion. Instead of relying on text as a foundation, it has been built from the ground up using actual human conversations, enabling it to facilitate full-duplex communication, where it can listen and speak simultaneously. Designed to operate locally on advanced hardware like the MacBook Pro equipped with an M4 Max chip or superior, Dessa effectively captures nuanced conversational elements such as emotions, sarcasm, laughter, pauses, and turn-taking, which are often diminished in text-based communication systems. Aimed primarily at AI safety researchers and developers, it serves as a powerful tool for examining voice model dynamics, privacy implications, and the intricacies of real-time interactions. Importantly, Dessa is not intended for general business use or as a hosted voice-agent solution, marking its specific role in the realm of research and development within the voice technology landscape. This specificity underscores its potential to deepen understanding of voice interactions and inform future AI advancements.

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.

API Access

Has API No 

API Access

Has API Yes 

Screenshots View All

Screenshots View All

Integrations

OpenAI No 
gpt-realtime No 

Integrations

OpenAI Yes 
gpt-realtime Yes 

Pricing Details

No price information available.
Free Trial No 
Free Version No 

Pricing Details

$0.40 per cached input
Free Trial Yes 
Free Version No 

Deployment

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

Customer Support

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

Types of Training

Training Docs No 
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

Block

Founded

2009

Country

United States

Website

block.xyz/dessa

Vendor Details

Company Name

OpenAI

Founded

2015

Country

United States

Website

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

Product Features

Product Features

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