What happened
Block announced Dessa, which its team calls the world's first AI trained only on human speech audio, skipping text entirely. It was trained on one NVIDIA GB200 NVL72 and can run locally on an M4 Max MacBook Pro.
Why it matters
Because Dessa learns from audio alone, it can overlap replies, backchannel and laugh mid-conversation, which the team says makes talking with it feel like talking with a person.
WHO IT HITSBusinesses building voice assistants or call-center automation may eventually get a model that handles natural interruptions and emotional nuance, though they cannot access Dessa yet since no API or model is public.
Summaries like this, every morning.
Dessa comes from a team with a long history: its members are from Dessa, a Toronto startup that has researched AI since 2012, and they now work as a small AI research group inside Block, reporting results directly to CEO Jack Dorsey. Dorsey framed the launch around voice as the most natural way to interact with intelligence, describing conversations with Dessa as full of emotion, nuance, pauses and a natural cadence.
The design choice sets Dessa apart from voice systems built as extensions of text-generating models, which strip out intonation and emotion that text cannot capture. Dessa was built for real-time conversation from the start and trained only on human speech audio.
What remains open is access. The model and API are not public, and the team is still recruiting AI safety researchers to examine risks, so any broader availability appears to depend on that review rather than a stated date.
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