CoinDesk
Block has unveiled Dessa, a voice AI trained entirely on human speech rather than text that listens while it talks, handling interruptions, laughter and shifts in tone. CEO Jack Dorsey said talking with it feels like talking with a person, full of emotion, nuance, pauses and natural cadence. Trained from scratch on a single Nvidia GB200 NVL72 computing system, the model is compact enough to run locally on a MacBook Pro with an M4 Max chip or better.
Why it matters
Unlike systems that convert speech to text before responding, Dessa processes audio directly, which Block says could eventually let speech AI recognize emotional cues such as distress and pain that text transcripts miss. The model was built by an AI lab that reports directly to Dorsey and includes former staff from Toronto startup Dessa, which Square acquired in 2020.
The demo split reactions. Binance founder CZ sees a fit for his GiggleAcademy education project, saying teaching kids with current AI voices was a challenge. Filmmaker Justine Bateman asked why AI voices need to sound human at all, arguing the realism can trick people into lowering their guard, while journalist Shiv Aroor warned scam calls are about to hit pandemic levels.
Market impact
For now Dessa is a research preview, not a product. Block has disclosed no model size, benchmarks or release date, and its audio samples are company demonstrations rather than independent tests. Early access goes first to a small group of AI safety researchers, a gating choice that puts deception risk under review before any consumer rollout.
Block operates Square, Cash App, bitcoin wallet Bitkey and mining hardware unit Proto, so speech-native AI could eventually reach its payments and consumer products. Watch for independent benchmarks and how the safety cohort weighs the fraud risk.
Frequently asked questions
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What is Dessa and how is it different from other voice AI?
Dessa is Block's voice AI trained entirely on human speech rather than text. It processes audio directly, listens while speaking, and handles interruptions, laughter and changes in tone during a conversation.
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Can Dessa run locally without cloud servers?
Yes. Block says the model is compact enough to run on a MacBook Pro with an M4 Max chip or better, and it was trained from scratch on a single Nvidia GB200 NVL72 computing system.
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When will Dessa be publicly available?
Block has not disclosed a release date, model size or benchmark results. Dessa remains a research preview, with early access limited to a small group of AI safety researchers.
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Why are experts worried about Dessa's humanlike voice?
Critics including filmmaker Justine Bateman argue humanlike voices can mislead people into lowering their guard, while journalist Shiv Aroor warned scam calls could reach pandemic levels.
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What does CZ see in Block's voice AI?
Binance founder Changpeng Zhao said natural voice interaction could benefit his GiggleAcademy education project, noting that teaching kids with current AI voices was a challenge.
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