Replays of real runs
Click through real tasks given to Codex step by step — the brief, the run, the diff and the result.
// free mini-course
Vibecoding with ChatGPT Codex
Codex is an AI agent you delegate tasks to: you brief it, it works — in the app, in the cloud, even while you're at lunch. A hands-on course by a consultant who works with agents daily. The demo app in this course was built by Codex itself.
// your course progress (saved in this browser)
Lessons
Course contents
0 Codex: an agent, not a chat How it differs from a ChatGPT conversation, where it runs (app, CLI, cloud, mobile) and what to realistically expect. Quiz at the end. 1 Setup: the new ChatGPT app ChatGPT Plus is enough. Codex has been part of the desktop app since July 2026 — and there's a CLI for terminal fans. Your first task, step by step. 2 The task brief: writing for an agent You're writing for an agent that will work alone for 20 minutes. Write your own brief, get feedback, and watch a real app grow out of it. 3 Cloud: delegate and let it work Three tasks at once, each in its own sandbox. Reading diffs, forking a task, briefing from your phone. A decision game. 4 Guardrails: sandbox, approvals and limits Why Codex is read-only by default, what you approve, how the 5-hour limits work — and one true security story. Exercise: spot the risk. 5 AGENTS.md: project memory The file the agent reads before every task — understood by other tools too. Build a good AGENTS.md. 6 A real task from A to Z Case study: how Codex built the calculator for this course — including the moments it got stuck. The final challenge and course completion.How the course works
No two-hour video
Exercises with feedback
Write your own task brief and instantly learn what it's missing. Then compare it with a model answer.
Progress without sign-up
Your progress is stored only in your browser. No e-mail, no accounts, no cookies.
Already finished Vibecoding with Claude Code? You know most of
the principles — what awaits you here is mainly a different working model:
delegation instead of conversation. If you're new, the course stands entirely
on its own.
Rather have it done for you?
The course teaches you the basics. If you want AI and automation deployed in your company properly, let's start with an initial consultation — the fee is credited toward the project if we work together.