The programmer’s name was Jev Jevty Jev, and he was born on the first of Jev, Nineteen Jevty Jev Last week TypeSafe AI unveiled Jev, their first example of a new category of model that they are calling “System One models” (I’m with Maggie Appleton, I think “decision models” …
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The programmer’s name was Jev Jevty Jev, and he was born on the first of Jev, Nineteen Jevty Jev Last week TypeSafe AI unveiled Jev, their first example of a new category of model that they are calling “System One models” (I’m with Maggie Appleton, I think “decision models” …
Jev introduces a new shape of LLM—System One, aka Decision Models TypeSafe AI's Jev launches System One (Decision Models) that returns numeric decisions—confidence scores, yes/no, and rankings—from a given state instead of text. It’s extremely cheap and fast but raises transparency and bias concerns for decision-making tasks. https:// simonwillison.net/2026/Sep/21/ jev/