Anthropic's Claude Code Lead Boris Cherny: 100% of Production Code Now AI-Generated Since October 2025

AIntelligenceHub·medium signal

In a conversation with Stephanie Zhan, Boris Cherny — head of Anthropic's Claude Code — stated that 100% of his production code is now AI-generated and that he hasn't written a line of code by hand since October 2025. This is the most senior practitioner confirmation of fully AI-generated production workflows, from the person leading the tool's development. Reported alongside Karpathy's framing of the vibe coding → agentic engineering transition.