Hammer.ai · blog

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◆ Series

Hello World Models

A multi-part build: from why a few good rules beat a mountain of data, to a playable lending world that judges your AI.


  1. Part · Jun 30, 2026

    Hello World Models

    Why we build practice worlds for regulated AI, learned from games. The story behind the series, and what it explores: costs, tradeoffs, and worlds grown from the law itself.

  2. Part 1 · Jul 1, 2026

    Part 1: A World From a Seed

    A handful of procedural rules can grow a whole living world. First a planet from a seed, then life that adapts to it, procedurally, and with an LLM. This is how games can teach our agents.

  3. Part 3 · Jun 24, 2026 · ▶ interactive

    Play the Lending Game

    Interactive: build the lending game one mechanic at a time, then play the 30-year sim.