7 Hours, 12.5 Million Lines of Code? What OpenAI and Anthropic Just Did Changes Everything for Developers

Feb 22, 2026 — If you're learning to code right now, or if you've been writing code for years, today's news will hit you differently. OpenAI just published an internal experiment. Anthropic published another. And Cisco's president gave an interview that every developer needs to read. Here's what happened, in plain English. The Experiment That Broke Software Engineering Let me start with OpenAI. A team of 3 engineers. Five months. Zero human-written code. One million lines of code in production. That's not a typo. OpenAI ran an internal experiment where they literally banned humans from writing code. The rule was simple: no one on the team could write a single line of code by hand. Everything had to come from their AI agents (called Codex). The result? A complete product with hundreds of internal users. Built entirely by AI. Here's what makes this wild: even the instruction manual that told the AI how to work—a file called AGENTS.md —was written by the AI itself. Think about that for a