Machine Heart

Aug 3, 2026 · Artificial Intelligence

How Karpathy Built a LOTR 3D Scene in Two Hours for $10

Andrej Karpathy gave the opening paragraph of The Lord of the Rings to Opus 5 with a $10, 1‑million‑token budget, asked it to create a Three.js interactive 3D scene, and the model produced roughly 5,500 lines of code in two hours, revealing both the promise and current visual‑perception limits of large language models.