A plain-English guide to OpenAI's Codex desktop app. Whether you've never heard of it or you already live inside Claude Code, here's what it does, what it costs, and when to reach for it.
So What Even Is Codex?
You've probably heard the pitch by now. There's AI that can build a website for you, clean up your files, or put together a report while you go make coffee. Codex is OpenAI's version of that, and it runs as an app right on your computer.
Let's be precise about the word "app," because it matters. Codex is not a chatbot in a browser tab. It's a desktop program, made by the same company behind ChatGPT, that puts an AI agent on your machine. An agent is just AI that takes actions instead of only talking. ChatGPT on the web can tell you how to build a sales dashboard. Codex can open your files, build the dashboard, test it, and put it online.