karpathy had Claude Code build HackerTube, an HN video recommendation site, in about two hours

發生什麼事

@karpathy said YouTube's recommendations were not useful to them, so over a weekend they had Claude sift through roughly 43 million HN comments spanning 20 years and identify 6,454 videos people kept recommending. The result was HackerTube; building it with Opus 5.5 took about two hours. No login is needed, and the site keeps its state in the browser. Thumbnails use frames from around the middle of each video instead of images selected by uploaders.

karpathy's usual setup is the Claude Code desktop app on Mac, with Opus 5.5 and Medium effort as the defaults. Only three tasks required karpathy's direct input: creating a Google Cloud API key to look up YouTube video data, opening a VPS, and buying a domain. Once the server was ready, they gave Claude its IP address; Claude handled updates, hardening, deployment, and optimization.