Karpathy built a video site in a weekend with Claude
Andrej Karpathy used Claude to turn 20 years of Hacker News comments into HackerTube, a curated video site, according to The Decoder.
The facts
- According to The Decoder, Andrej Karpathy built HackerTube over a weekend using Claude's Opus 5.5 model.
- Claude filtered 43 million comments from 20 years of Hacker News and distilled them into 6,454 videos that keep getting recommended there.
- The site needs no login, shows one mid-video frame instead of optimised thumbnails, and stores state locally in the browser.
- Karpathy says he let Claude Code handle nearly all the work. His only manual steps were a Google Cloud API key, a rented server and the domain. These are his own claims, reported by The Decoder.
Case notes · Danny's take
Why it matters
The interesting part isn't the website. It's the data. Twenty years of people recommending videos to each other is a signal, and Claude turned it into a product in a weekend. If one person can do that, the scarce thing is no longer code. It's knowing which pile of data is worth digging through. Note that the speed claims come from Karpathy himself.
For builders
Look for communities with years of public recommendations, reviews or discussions that nobody has distilled. Pair that data with a coding agent and you can test an idea in days, not weeks. Keep it simple, as this project did: no login, local state, one rented server.
Not financial advice. Do your own investigation.
This story was summarised with AI from The Decoder's reporting and checked against our editorial policy. Danny's take reflects his views. Disclaimer.
Danny Walter
Founder of Moon Republic, Volt Terminal and Moon Republic Academy. Author of The Market Is a Crime Scene and After the Applause.