DessaBlock
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gpt-realtimeOpenAI
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Related Products
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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.
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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.
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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
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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
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Audience
AI safety researchers and developers evaluating or building speech-based conversational AI.
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Audience
Enterprises requiring a solution to build sophisticated, natural-sounding voice agents
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
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Support
Phone Support
Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
Supported
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Screenshots and Videos |
Screenshots and Videos |
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Pricing
No information available.
Free Version
Not Supported
Free Trial
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Pricing
$20 per month
Free Version
Supported
Free Trial
Not Supported
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Reviews/
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Reviews/
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Training
Documentation
Not Supported
Webinars
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Live Online
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In Person
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Supported
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Company InformationBlock
Founded: 2009
United States
block.xyz/dessa
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Company InformationOpenAI
Founded: 2015
United States
openai.com/index/introducing-gpt-realtime/
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Categories |
Categories |
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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
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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
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