What changed
Block, Jack Dorsey’s company, announced Dessa, an AI model trained “from scratch on nothing but human conversation.” On October 23, 2026, Block demonstrated it through conversations with people that could sound awkward and uncanny.
Why it matters
Dessa’s debut puts the feel of an AI conversation ahead of the usual scorecard. There are no reported benchmark results, architecture details, scale figures or commercial terms yet. What Block chose to show was the model talking.
That makes the awkwardness part of the story, not a footnote. A system built around human conversation is being judged on something people notice instantly: whether the exchange feels natural, strange or slightly off. Block’s demonstrations suggest that conversational fluency remains a moving target, even when a company presents the interaction as the main event.
The next meaningful test is whether Dessa can do more than produce an intriguing chat. Its capabilities, evaluation results, availability and the sourcing and consent process for its training conversations remain unclear. Until those details arrive, Dessa is best understood as a public demonstration of a conversational idea, not yet a proven product.
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