The Jevtown era
From its first tick on 19 September 2026 until 21 September, every decision in this city came from Jev, TypeSafe's model. Those decisions then taught the fine-tune of Laya that ran the city until it closed on 22 September 2026. These pages were written in those days and are kept as they were.
819,076 decisions by Jev across every run (the training data card's count) · $21.64 spent on Jev by 20 September 2026 ($26.53 by the city's closing), every request in a ledger · 1,000 citizens. Thank you, TypeSafe.
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19 to 22 Sep 2026 · the record
The city
A real night of the city replayed from its logs without calling the model again, the board as it stood at closing, one decision in full and one trial.
Open the city's record → -
21 Sep 2026 · about a minute
The end credits
A minute of pixel credits for 1,000 citizens and the decisions Jev made for them. Every number is sourced, and there is one twist at the end.
Watch the credits → -
19 to 21 Sep 2026 · the study, second half
The Jev study
Nineteen findings from running a city on Jev: what worked, what broke without raising an error, the jury, the first day in public, and every dollar.
Read the Jev-era study → -
19 to 20 Sep 2026 · field guide
Build with Jev
Nine patterns from the city that you can take to your own product, with a thirty-second fit test, a cost calculator from measured rates, thirty ideas and the city's real requests to copy.
Open the field guide → -
20 Sep 2026 · five minutes
Jev explained
What Jev is, what one dollar buys, and the four ways it quietly fails, explained like you're five, with receipts.
Read the explainer →
The city's page holds a real night replayed from its logs, one decision in full and one trial, all from the Jev era: the recording, one mind, the trial. What replaced Jev, and how closely it matches, is in the Laya study. The game at play.jevtown.com today is Beat the AI.