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Models · Updated 15 Oct, 02:53 am IST

Claude Opus 5.5 Max built a three.js game in an iPhone chat session

Image: Simon Willison

Why it matters for readers: A clear example of an AI building a small, enjoyable game from a short prompt you can try yourself.

  • Simon Willison used the default Claude iPhone app (chat mode) to prompt Claude Opus 5.5 Max to build a game.1
  • The requested game, "Tree appreciator," was implemented in three.js and shows two algorithmically generated trees for players to compare.1
  • Claude spent roughly 3 hours and 7 minutes generating a playable spot-the-difference game with music, animation, and achievements.1
  • Willison reported that telling Opus 5.5 to "make sure it is fun" produced unexpectedly good results.1
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