Sometimes a small experiment says more than any benchmark. On August 5th, Simon Willison — one of the sharpest observers of the AI coding scene — published a playable browser game built entirely from a single prompt. The name: ‘Raccoon Heist’. You control a crew of thieving raccoons and pull off one job after another, from robbing banks to stealing priceless art.
What he did
The idea came from an old 2024 tweet — a game concept generated back then by GPT-3. Willison wanted to know whether Claude Fable 5, running in Claude Code for web, could turn it into a finished game. So: he dumped screenshots of the concept in, wrote a prompt telling it to ‘write a game’, and then left the model to its own devices.
The result was a working game. Willison links both the playable version and the GitHub repository. Not a polished AAA title, but a complete, playable result from one run — which is exactly what ‘one-shot’ means: no intermediate steps, no fixing things up by hand.
My take
Why is this more than a fun toy? Because it shows how the bar has shifted. Not that long ago, a ‘one-shot’ program was a Snake clone or a calculator. Now it’s a game with mechanics, states, and a little story — from a single prompt.
Two things I’m taking away. First: Fable 5 is strong at exactly this — complex tasks in one pass, without needing to be led by the hand. Second, Willison’s approach is instructive for everyday work. He feeds the model visual context (screenshots) instead of long specs and then lets it work on its own. If you build with Claude Code yourself, there’s something to borrow here: sometimes a good image and a clear brief are worth more than pages of instructions. And yes — I played the raccoon heist myself. It’s fun.
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