Put together some notes on Jev and the new category of system one aka decision models simonwillison.net/2026/Sep/21/je…↗
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All the grifters are completely wrong about Jev’s architecture so I decided I’d release an open-weight version. BUT training takes time, so while we all wait I decided I’d drop the sauce. archerhume.com/posts/jevs-arc…↗