Andrej Karpathy Just 10x’d Everyone’s Claude Code

Andrej Karpathy shared a method for building personal LLM-powered knowledge bases using Claude Code and markdown files. The approach involves feeding raw documents (PDFs, articles, transcripts) to Claude Code, which automatically organizes them into a structured wiki with relationships, indexes, and backlinks — stored as plain markdown files viewable in Obsidian. This eliminates the need for vector databases or embedding pipelines for small-to-medium scale knowledge bases (up to hundreds of documents). The tutorial walks through setting up a vault, ingesting content via the Obsidian Web Clipper extension, and querying the resulting wiki. It also compares this approach to traditional semantic search RAG, noting the wiki approach is simpler and cheaper at small scale but doesn't scale to millions of documents.