Reddit user builds a browser snow simulation in 9 hours with Claude Opus 5
Scobleizer · x · 2026-07-29
A Reddit user built a AAA-style snow simulation in a browser tab with Claude Opus 5.
- The demo includes millions of snow particles, cloth physics, terrain deformation, water-based spells, and a snow-surfing system with spray and sunlight effects.
- It runs in one browser tab on WebGPU, with no game engine or 3D modeling software.
- The creator says they wrote one detailed prompt; Opus 5 planned the architecture, wrote shaders, built physics, iterated from screenshots, and documented decisions.
- The whole project reportedly took 9 hours and about 4 million tokens, and is interactive right now.
Related event: Claude Code builds AAA-level WebGPU snow simulation in 9 hours(3 posts)→
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