The author of Bun rewrote the project in Rust using a pre-release version of Claude Fable 5, a Mythos-class model, and a dynamic workflow system, resulting in a 1,009,272-line diff and 6,502 commits. The rewrite took 11 days and was reviewed by 64 Claudes, with the project now having 24/7 coverage-guided fuzzing and 11 rounds of security review completed.