Boris Cherny revealed that he had not hand-written code for a month, submitting 259 PRs in 30 days. His workflow starts with planning-mode iteration before enabling auto-accept mode, based on the idea that “once the plan is right, the code follows naturally.” The article also mentions that Claude wrote about 80% of Anthropic's internal code, overwhelming its CI system and leading to a rebuild, and that Claude Cowork was written by Claude Code in about ten days.