Karpathy says Claude Opus 5.5 built HackerTube, a site of 6,454 videos recommended on Hacker News, in about two hours

In his Oct. 31 post, Karpathy says Opus filtered Hacker News comments with Sonnet in a Claude Code workflow down to about 40,000 recommendations and deployed the site, while he only created an API key, booted a server and bought the domain; the timings are his own account.

Read at Andrej Karpathy (blog)

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