# The 27-Year Bug: What Mythos Found in OpenBSD That Nobody Else Did

- slug: the-27-year-bug-what-mythos-found-in-openbsd-that-nobody-else-did
- date: 2026-04-23
- category: Artificial Intelligence

OpenBSD's code is reviewed by some of the most security-obsessed developers on the planet. They missed this for nearly three decades. Anthropic's Mythos model found it in weeks.

---