Dessa

Dessa

Block
+
+

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About

Dessa is Block's speech-to-speech artificial intelligence model for conversational voice research and applications. It takes audio input and produces audio output directly, without converting speech into text as an intermediate step. Trained from scratch on human conversation rather than text, the model supports full-duplex interaction, listening and speaking at the same time, and runs locally on a MacBook Pro with an M4 Max chip or better. It captures conversational cues such as emotion, sarcasm, laughter, pauses, and turn-taking that can be lost in text-based pipelines. Dessa is intended for AI safety researchers and developers studying voice-model behavior, privacy, and real-time interaction. It is a speech model for research and development, not a general-purpose business application or hosted voice-agent platform.

About

GPT-Realtime is OpenAI’s most advanced, production-ready speech-to-speech model, now accessible through the fully available Realtime API. It delivers remarkably natural, expressive audio with fine-grained control over tone, pace, and accent. The model can comprehend nuanced human audio, including laughter, switch languages mid-sentence, and accurately process alphanumeric details like phone numbers across multiple languages. It significantly improves reasoning and instruction-following (achieving 82.8% on the BigBench Audio benchmark and 30.5% on MultiChallenge) and boasts enhanced function calling, now more reliable, timely, and accurate (scoring 66.5% on ComplexFuncBench). The model supports asynchronous tool invocation so conversations remain fluid even during long-running calls. The Realtime API also offers innovative capabilities such as image input support, SIP phone network integration, remote MCP server connection, and reusable conversation prompts.

Platforms Supported

Windows Not Supported
Mac Supported
Linux Not Supported
Cloud Not Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

AI safety researchers and developers evaluating or building speech-based conversational AI.

Audience

Enterprises requiring a solution to build sophisticated, natural-sounding voice agents

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

$20 per month
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Supported

Company Information

Block
Founded: 2009
United States
block.xyz/dessa

Company Information

OpenAI
Founded: 2015
United States
openai.com/index/introducing-gpt-realtime/

Alternatives

Alternatives

Grok Voice 3.0

Grok Voice 3.0

SpaceXSI
Eleven Realtime

Eleven Realtime

ElevenLabs
Higgs Realtime

Higgs Realtime

Boson AI

Categories

AI Voice Models Supported

Categories

AI Models Supported
AI Voice Agents Supported

Integrations

Azure Voice Live API Not Supported
ChatGPT Not Supported
GPT-Realtime-1.5 Not Supported
GPT-Realtime-2 Not Supported
GPT-Realtime-2.1 Not Supported
GPT-Realtime-Translate Not Supported
GPT‑Realtime‑Whisper Not Supported
Microsoft Foundry Models Not Supported
OpenAI Not Supported
SmartCallz Not Supported

Integrations

Azure Voice Live API Supported
ChatGPT Supported
GPT-Realtime-1.5 Supported
GPT-Realtime-2 Supported
GPT-Realtime-2.1 Supported
GPT-Realtime-Translate Supported
GPT‑Realtime‑Whisper Supported
Microsoft Foundry Models Supported
OpenAI Supported
SmartCallz Supported
Claim Dessa and update features and information
Claim Dessa and update features and information
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