AnalysisAI ModelsOctober 15, 2026

Simon Willison builds Three.js game with Claude Opus 5.5 Max

Read original source →simonwillison.net

Prompted from the default Claude iPhone app in chat mode, Claude Opus 5.5 Max ran for 3 hours and 7 minutes before returning a spot-the-difference game called "Tree Appreciator" with music, animation and achievements. Willison says telling Opus 5.5 to "make sure it is fun" worked "uncomfortably well".

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