I gave Jev the keys to Arthenix city.

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Ran 124 simulated lives in Arthenix city, letting Jev decide each character's work, breaks, hangouts and trips home.

The original post

I gave Jev the keys to Arthenix city. Now it runs 124 lives. Each has their own personality, job, habits and friends, and Jev decides what they do: when they work, when they take a break, who they hang out with, when they head home. A truly living world. 🧵

Engagement when collected

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Numbers are a snapshot taken from X when the case was added to the library (schema v1, collected 2026-09-19); they will not match today.

Where this case fits

Filed under coding & developer tools. In the pattern Jev is built for, the model answers a bounded question per step — and ordinary code acts on the answer, because the answer is already a value rather than a paragraph. Other posts in the same family are on the coding & developer tools page.

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Last updated: 2026-09-22 · sources & corrections · every card links to its author's original post