Post

@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” …

it's not really a new idea, but the way they focused on the dev experience right out of the gate definitely helped it explode

22/9/26, 12:53 pm0 reposts0 likes

No replies yet.