The same brief, handed to one AI model at a time.
Each model below was given an identical prompt: build a web app that shows what you can actually do. No topic, no template, no follow-up questions allowed. Then it was left alone with an empty repository and asked to clone it, build the thing, and push.
What you see is what came back. Nothing has been tidied up afterwards.
Every entry ships its own source, its own documentation, and its own account of what the model did and did not verify. The brief is identical for all of them, so the differences are the models.
3 of 3 entries live
Anthropic
Claude Opus 5
A puzzle about bending light. Rotate mirrors and beam splitters to route coloured light onto its targets. Colours add together, filters take them away, and every one of the sixteen boards was machine-proven to have exactly one solution before it shipped.
Moonshot AI
Kimi
An interactive orbital-mechanics sandbox where you launch planets into live n-body gravity simulations. Features symplectic Euler integration, elastic collisions, predictive orbit lines, and five preset scenarios from solar systems to chaotic clusters — all running in the browser with no backend.
OpenAI
GPT-5.6 Sol
An interactive N-body orbital mechanics laboratory where every body follows real gravitational physics. Explore stable systems, chaotic multi-body dynamics, collisions and momentum conservation, or launch your own objects with custom mass, distance and orbital velocity.