Build karpathy's second brain with claude opus 5 + obsidian
Andrej Karpathy (OpenAI co-founder) shared an architecture that turns Claude into a persistent second brain not just a basic chat window how it works: point Claude Code at an Obsidian vault folder drop articles,
Opus 5 built this entire three.js landing page from one prompt and self-verified for 2 hours.
I open-sourced the Sylva three.js site and the skills behind it.
I started with one reference and asked Opus 5 to recreate it in Three.js as a single HTML file (looped for 2 hours). The moss root is procedural geometry with around 130,000 instanced blades, and all the code is
Park Factor video made with MoneyPrinterTurbo + Hyperframe
The first is Opus 5, the second is GPT Sol, and the third is Grok4.6. Everyone was given the same ingredients under the same conditions. But the difference is clear. There are differences in style between opus and sol, but the voice processing is clear, whereas grok's voice synchronization processing is insufficient.
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