Garages, chalk and one ball for the whole yard ⚽

Claude Opus 5.5 vs. GPT-6 Astra - same prompt: build a 3D backyard with pixel-art rendering and a game of four square

Eight kids, four zones, a queue and ball physics. The players’ AI predicts interceptions and chooses shots. Rain interrupts the game and washes away the chalk - once the court dries, the kids redraw it

All in a single HTML file using Three.js

API costs:
Claude Opus 5.5 - 10.37$
GPT-6 Astra - 10.75$

Who did it better?