Claude Opus 5.5 builds GTA-style 3D city NEON BAY in under two hours
The author says Opus 5.5 wrote 2,561 lines of three.js code across two tasks in 1 hour 46 minutes, producing a browser-based open city with 300+ intersections, police chases and seed-swappable layouts.
this GTA-style city has 300+ intersections, 3 bridges, underground garages and cops that box you in no human wrote a single line of it Claude Opus 5.5 built the whole thing in 2 tasks and 1 hour 46 minutes of build time it's called NEON BAY, 2,561 lines of code, three.js for graphics, runs in a browser tab with nothing to install streets aren't a grid, they grow out of Voronoi cells, and a river cuts right through the middle add ?seed= and any number to the link and you get a brand new city, it tested 13 of them 7 cars in a showroom, from an 818 hp hypercar doing 0-100 in 2.8 s to a box van that needs 13.1 those numbers aren't typed in, game's own physics measures each car live every car is a real 3D body simulated 120 times a second, with suspension, tyre grip, a gearbox, ABS and traction control switch traction control off in the rear-drive muscle car, pin throttle at full lock and it spins you around steal any car including cop cars, drift for cash, hit jumps in the parks or drive straight off the pier into the sea wanted level runs 1 to 5 stars and police are real physics cars that chase you across town hit 3 stars and a helicopter with a searchlight joins it even crash-tested its own game and caught a car getting launched 5 m up after hitting a garage wall that was 1 of 20+ bugs it found and fixed on its own save this, it's public on my GitHub in Bio and free to play