ChatGPT/Codex vs Claude: What the Coding Mythos Gets Wrong OpenAI’s Codex arrived in 2021 and rewrote how developers thought about AI-assisted coding. It powered GitHub Copilot, seeded the imagination of every startup founder, and created a mythos around ChatGPT/Codex that persists today: if you are serious about writing code with AI, you use Codex. Claude, in this narrative, is for writers and analysts. That mythos is wrong, and understanding exactly where it breaks down is worth your time if you are choosing an AI coding stack right now. ...