Example of OpenErrata nitting the Sequences I just published OpenErrata on GitHub, a browser extension that investigates the posts you read using your OpenAI API key and underlines any factual claims that are sourceably incorrect. Once finished, it caches the results for anybody else reading the same articles so that they get them on immediate visit. If you don't have an OpenAI key, you can still view the corrections on posts other people have viewed, but it doesn't start new investigations.
I've noticed lately that while people do this sort of thing by pasting everything you read into ChatGPT, A. They don't have the time to do that, B. It duplicates work, and C. It takes around ~5 minutes to get a really good sourced response for most mid-length posts. I figure most of LessWrong is reading the same stuff, so if a good portion of the community begins using this or an extension like it, we can avoid these problems.
Here is OpenErrata at work with some recent LessWrong & Substack articles, published within the last week. I consider myself a cynical person, but I'm a little surprised at what a high percentage of the articles I read make [...]
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First published: February 24th, 2026
Source: https://www.lesswrong.com/posts/iMw7qhtZGNFxMRD4H/open-sourcing-a-browser-extension-that-tells-you-when-people ---
Narrated by
TYPE III AUDIO.
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