On December 27, 2025, Anthropic’s lead engineer Boris Cherny posted on X: “In the last thirty days, 100% of my contributions to Claude Code were written by Claude Code.” 259 pull requests. 497 commits. 40,000 lines added. 1.3 million views. The tech world applauded.

Three months later, a packaging mistake exposed 512,000 lines of that code to the public. Leaks happen. Companies recover. The leak isn’t the story.