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@simonwillison.net

Put together some notes on Jev and the new category of system one aka decision models simonwillison.net/2026/Sep/21/...

simonwillison.netJev introduces a new shape of LLM—System One, aka Decision ModelsLast 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” …

@jonathan.boxcake.net

Several of these made public now, some much better or worse than others. I did a write up on the latest one bsky.app/profile/jona...

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28/9/26, 9:10 pm0 reposts1 like

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