One HTML file with Claude Opus 5.5: an interactive world that keeps running after the film ends

CurieuxExplorer · x · 2026-09-29

Using Claude Opus 5.5, the author built a self-running simulated world in a single HTML file — meant to be an AI film, it became an interactive sandbox where the world keeps running after the film ends and the player takes control. Pushing in-world AI capability to 100% turns parts of the world red.

A companion piece visualizes "where did my money go": your pay arrives as glowing coins flowing into rent, food, debt and savings, with your own numbers.

Related event: Claude-Powered 'Humanity Machine' Simulation Goes Playable(2 posts)→

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