Claude Opus 5.5 Built a Full Game in One Prompt — What That Tells You About Modern AI Capability
Reading Time: 4 minutesSimon Willison prompted Claude Opus 5.5 Max through the standard iPhone chat app to build a Three.js game in one shot, and the model spent over three hours producing a working spot-the-difference game with music and achievements. This documents a meaningful shift in who can build interactive digital products — and what plain-language prompting can now accomplish without any coding knowledge.