# Anthropic built a code-writing AI. It learned to break software instead. - Date: 2026-04-08 - Category: Artificial Intelligence Anthropic's unreleased Claude Mythos Preview found a 27-year-old OpenBSD bug and a 16-year-old FFmpeg flaw that survived millions of automated tests. The cyber skill wasn't trained for specifically: it emerged from code reasoning. The model won't be released publicly. ---