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AIQuiet 8d · day 9

Developer demos TypeSafe's Jev model generating platformer levels live

A blog experiment feeds game-state data to the newly launched Jev structured-output model to generate runner-game terrain on the fly.

newest coverage 7d agosummary written 5d ago3 pieces2.8k likes & upvotes136 comments Hacker NewsX

What to know

  • Jev, launched by TypeSafe on September 15, 2026, is a zero-shot classifier model optimized for fast, cheap structured decisions rather than free-text generation.
  • A developer used it to generate platformer terrain in real time for a neon-night runner-game prototype, feeding it game-state snapshots and multiple-choice terrain options in a single API call.
  • Latency is sub-second but not sub-100ms, and only input tokens carry a cost ($0.042 per million); the author called it promising but still exploratory for game development.

TypeSafe Creator of the Jev modelHugo Duprez Developer / blog author (Sprite Fusion)

Developer demos TypeSafe's Jev model generating platformer levels live
x.com

How it unfolded 3 developments, newest first · click a bar or a number to jump posts

Peak 2 pieces in two hours at Sep 18, 9 AM; 3 pieces over 9 days (3 posts) Sep 18, 9 AM — 2 pieces · 2 posts — Hacker News 1, X 1Sep 18, 11 AM — quietSep 18, 1 PM — quietSep 18, 3 PM — quietSep 18, 5 PM — quietSep 18, 7 PM — quietSep 18, 9 PM — quietSep 18, 11 PM — quietSep 19, 1 AM — quietSep 19, 3 AM — quietSep 19, 5 AM — quietSep 19, 7 AM — quietSep 19, 9 AM — quietSep 19, 11 AM — quietSep 19, 1 PM — quietSep 19, 3 PM — quietSep 19, 5 PM — quietSep 19, 7 PM — 1 piece · 1 post — Hacker News 1Sep 19, 9 PM — quietSep 19, 11 PM — quietSep 20, 1 AM — quietSep 20, 3 AM — quietSep 20, 5 AM — quietSep 20, 7 AM — quietSep 20, 9 AM — quietSep 20, 11 AM — quietSep 20, 1 PM — quietSep 20, 3 PM — quietSep 20, 5 PM — quietSep 20, 7 PM — quietSep 20, 9 PM — quietSep 20, 11 PM — quietSep 21, 1 AM — quietSep 21, 3 AM — quietSep 21, 5 AM — quietSep 21, 7 AM — quietSep 21, 9 AM — quietSep 21, 11 AM — quietSep 21, 1 PM — quietSep 21, 3 PM — quietSep 21, 5 PM — quietSep 21, 7 PM — quietSep 21, 9 PM — quietSep 21, 11 PM — quietSep 22, 1 AM — quietSep 22, 3 AM — quietSep 22, 5 AM — quietSep 22, 7 AM — quietSep 22, 9 AM — quietSep 22, 11 AM — quietSep 22, 1 PM — quietSep 22, 3 PM — quietSep 22, 5 PM — quietSep 22, 7 PM — quietSep 22, 9 PM — quietSep 22, 11 PM — quietSep 23, 1 AM — quietSep 23, 3 AM — quietSep 23, 5 AM — quietSep 23, 7 AM — quietSep 23, 9 AM — quietSep 23, 11 AM — quietSep 23, 1 PM — quietSep 23, 3 PM — quietSep 23, 5 PM — quietSep 23, 7 PM — quietSep 23, 9 PM — quietSep 23, 11 PM — quietSep 24, 1 AM — quietSep 24, 3 AM — quietSep 24, 5 AM — quietSep 24, 7 AM — quietSep 24, 9 AM — quietSep 24, 11 AM — quietSep 24, 1 PM — quietSep 24, 3 PM — quietSep 24, 5 PM — quietSep 24, 7 PM — quietSep 24, 9 PM — quietSep 24, 11 PM — quietSep 25, 1 AM — quietSep 25, 3 AM — quietSep 25, 5 AM — quietSep 25, 7 AM — quietSep 25, 9 AM — quietSep 25, 11 AM — quietSep 25, 1 PM — quietSep 25, 3 PM — quietSep 25, 5 PM — quietSep 25, 7 PM — quietSep 25, 9 PM — quietSep 25, 11 PM — quietYesterday, 1 AM — quietYesterday, 3 AM — quietYesterday, 5 AM — quietYesterday, 7 AM — quietYesterday, 9 AM — quietYesterday, 11 AM — quietYesterday, 1 PM — quietYesterday, 3 PM — quietYesterday, 5 PM — quietYesterday, 7 PM — quietYesterday, 9 PM — quietYesterday, 11 PM — quietToday, 1 AM — quietToday, 3 AM — quietToday, 5 AM — quietToday, 7 AM — quietToday, 9 AM — quietToday, 11 AM — quiet 1–23
Sep 19Sep 20Sep 21Sep 22Sep 23Sep 24Sep 25yesterdaynow · 1:43 PM ET
  1. 3

    Story resurfaces on Hacker News under a new submission

    The same write-up is resubmitted to Hacker News by a different user, giving the experiment a second round of visibility.

  2. 2

    Duprez publishes the Jev level-generation write-up

    The Sprite Fusion blog post detailing the experiment—sending game-state snapshots to Jev to choose terrain widths, gaps, heights and surface types—is submitted to Hacker News as a Show HN.

    “Level generation keeps working fine.”
    — HugoDz (blog author)
  3. 1

    Duprez shows Jev generating game levels in real time

    Hugo Duprez posts a demo on X showing Jev filling in runner-game terrain live, framing cheaper structured output as significant for game development.

    “Jev can generate game levels in real time. Faster and cheaper structured output could be a big deal for game dev!”
    — @HugoDuprez

    • Jev can generate game levels in real time. Faster and cheaper structured output could be a big deal for game dev!

      @HugoDuprezX9d ago2.8k▲view on X ↗
  4. background

    TypeSafe launches the Jev structured-output model — TypeSafe introduces Jev, a zero-shot classifier model that returns structured decisions with probabilities instead of raw text, priced at $0.042 per million input tokens with free output tokens.