Andrej Karpathy Uses Claude Opus 5.5 to Build Custom Video Platforms Over a Weekend
Former OpenAI co-founder Andrej Karpathy created two curated video platforms, HackerTube and TristanTube, using Claude Opus 5.5 and Claude Code. The project demonstrates how advanced AI tools can condense weeks of software development into just a few hours.
Andrej Karpathy, an OpenAI co-founder and current Anthropic AI researcher, has built a curated video platform called HackerTube over a single weekend using Anthropic's Claude Opus 5.5 model.
The project highlights how rapidly evolving AI coding assistants are streamlining full-stack software development, turning complex tasks that once required weeks of effort into lightweight weekend projects.
Distilling 20 Years of Data into HackerTube
To build HackerTube, Karpathy used Claude Opus 5.5 to analyze 43 million comments spanning 20 years of Hacker News discussions. The AI distilled this vast dataset into a curated list of 6,454 videos that are frequently recommended across the community.
Writing on X, Karpathy noted that the resulting platform delivers a "significantly better viewing experience" than YouTube's native recommendations. HackerTube strips away common web friction: it requires no login, replaces algorithmic, click-optimized thumbnails with a single mid-video frame, and stores user state locally within the web browser.
Fast Iteration with TristanTube
Immediately following the launch of HackerTube, Karpathy built a second platform called TristanTube. Leveraging Claude Code, he was able to "one-shot" the creation of the site in just three minutes.
TristanTube pulls together a collection of 47,000 videos based on a YouTube channel list curated by Tristan Hume.
Minimal Manual Intervention
Throughout the process, Karpathy allowed Claude Code to manage almost every aspect of development, ranging from initial data analysis to complete server setup.
According to Karpathy, his manual contributions were minimal, limited to obtaining a Google Cloud API key, renting a server, and purchasing the domain name. Reflecting on the experiment, Karpathy stated that software projects that previously took weeks to complete can now be built in just a few hours.
