Claude Opus 5 one-shots playable 3D games from a single prompt
Three.js shooters, a kart racer, a full Minecraft clone — physics and shaders written from scratch, millions of tokens a run. Plus OpenAI cuts Luna.
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What you can build this weekend
From one prompt, Opus 5 writes playable 3D games as single Three.js HTML files: a Call-of-Duty-style shooter, a kart racer deployed as a live site, and a Minecraft clone with 15 biomes and infinite terrain — geometry, shaders, physics and controls all generated as code you can read and edit.
The catch: token burn
These runs aren't cheap. The Decoder clocked one Minecraft clone at ~25M tokens; another builder reportedly spent ~690M tokens on an overnight “3A”-scale attempt. Great for a weekend prototype, punishing as an everyday loop.
How to try it tonight
Ask Opus 5 for a single self-contained HTML file using Three.js and iterate in one long session — no engine, no imported assets. Matt Shumer's “Claude-of-Duty” shows the pattern: describe the mechanics, then refine the physics and shaders by hand.
Elsewhere: OpenAI cuts Luna ~80%, adds Fast mode
OpenAI's latest API update dropped GPT-5.6 Luna pricing ~80% (Terra ~20%) and replaced Priority Processing with “Fast mode” — up to 2.5× faster at 2× the price. Worth re-checking your default-model and latency math.