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# Block's Dessa is a voice AI trained only on human speech, with no text at all
- URL: https://www.skimwire.com/block-dessa-speech-only-voice-ai-model/
- Published: 2026-10-24T16:03:42.000Z
- Updated: 2026-10-24T16:03:42.000Z
- Description: Block's Dessa learned to talk from conversation audio alone, listens while it speaks, and runs on a MacBook Pro M4 Max. It's a research preview.
- Author: Jeremy Moon
- Tags: AI

## The skim

- Block, Jack Dorsey's payments company, has unveiled Dessa, a voice AI model it says was trained "from scratch on nothing but human conversation," with no text and no pretrained models.
- It's full-duplex, so it listens and talks at the same time, and Block says it runs locally on a MacBook Pro with an M4 Max chip or better.
- You can't use it yet. It's a research preview with a waitlist, and a small group of AI safety researchers gets early access first.

## What Block announced

Most voice assistants turn your speech into text, run it through a text model and read the answer back. Dessa skips the text entirely. "Audio in, audio out," [Block's Dessa page](https://block.xyz/dessa?ref=skimwire.com) says. "Dessa is a true speech-to-speech model, and everything it knows came from human speech."

Because it learned from real conversations, Block says Dessa knows when to cut in and when to backchannel with a "yeah!" or "got it!", and that it hears and produces emotion, sarcasm and laughter that a text pipeline throws away. Block says inference runs faster than real time.

The lab also makes two efficiency claims: Dessa learned language from "hundreds of times fewer words" than text-based models need, and it was trained on a single Nvidia GB200 NVL72 system.

## How it sounds

Block posted live recordings of people talking to Dessa, plus one of Dessa chatting with OpenAI's GPT-Live-1 voice model. [The Verge](https://www.theverge.com/ai-artificial-intelligence/1017906/jack-dorsey-block-dessa-ai-voice-speech?ref=skimwire.com) found the conversations mostly natural but sometimes "awkward and uncanny." In one clip, the model starts off thinking the speaker is someone named "Ronaldo."

## Who's behind it

Dessa comes from a small AI research lab inside Block, founded by former members of Dessa, the Toronto deep-learning startup, and reporting directly to Dorsey. The team gives three reasons for building it: curiosity, better understanding between people and AI, and safety. "Imagine being in serious pain while a voice AI has no idea and just keeps going," the team writes. "That's the safety problem."

## The fine print

Everything so far is Block's own claim. It hasn't published a model size, benchmarks, latency figures, supported languages or a technical paper, and there's no API, download or price. The demo clips are chosen by Block, so they show what Dessa can do, not how often it does it.

## What's next

Block is taking early-access applications from AI safety researchers on the Dessa page and wants outside eyes on a model "that learned to talk from sound alone." A wider release hasn't been announced.

*Sources:* [*Block*](https://block.xyz/dessa?ref=skimwire.com) *and* [*The Verge*](https://www.theverge.com/ai-artificial-intelligence/1017906/jack-dorsey-block-dessa-ai-voice-speech?ref=skimwire.com)*.*