Codex Free Course: Master ChatGPT Codex in One Hour (2026)
A genuinely free one to start with. Looking for a Codex free course? This is a full, free one-hour beginner course on ChatGPT Codex — powered by the new GPT 5.6 Sol model — that shows you how to build and automate almost anything.
Websites, scheduled agents, emails, slide decks, videos and apps, all from one tool. Watch the full course below, and here’s what you’ll learn.
Last updated: July 2026.
Key takeaways
A free one-hour ChatGPT Codex course — the full course is the video above.
It’s a genuine hour of hands-on training. You’ll learn:
Installing Codex and building locally vs in the cloud
Plan mode vs action mode — and why planning first gives better outputs
Managing tokens and usage (frontier models are powerful but expensive to run)
Connecting plugins — Gmail, presentations and computer use
Building a real website (a productised SEO-agency store) from brand assets
Scheduled agents and Gmail ‘loops’ that draft your emails before you wake up
Creating animated promo videos with the open-source ReMotion skill
Building an Agent OS dashboard, switching models (GPT 5.6 Sol, OmniRoute, HY3), and an Obsidian second brain
How to Get Started With Codex
Getting going is simple: download Codex from the ChatGPT/OpenAI site and log in — the app changed recently with GPT 5.6 Sol. From there you pick a project folder, choose local or cloud, and start building.
One thing the course is honest about: GPT 5.6 Sol is powerful but token usage adds up, so it also covers keeping costs down — including routing to free APIs. See my free Codex setup guide for that side.
Why Plan Mode Matters
One thing the course drills in: plan before you build. Research (from Kilo Code) found that planning first produces better outputs, because the decisions are made up front instead of the agent going off track mid-build. So you use plan mode to map the project, then switch to action mode to build it.
For anything non-trivial, that two-step — plan, then build — is the difference between a clean result and a mess.
Keeping Codex Costs Down
GPT 5.6 Sol is powerful, but frontier models are expensive to run, so token usage is the real constraint. The course covers staying efficient — including routing Codex through free providers like OmniRoute (with HY3 as a fallback) so you can build far more before anything caps out.
Pair that with the token-minimizer tools in my RTK vs Caveman guide and you can run Codex hard without the bill.
What You’ll Be Able to Build
By the end you can build and automate real, sellable work — not just toy demos:
Build this
In the course
Websites & apps
A productised SEO store; a gamified habit-tracker app
Yes — the full one-hour course is the free video above. For the deeper masterclass and my Agent OS, there’s the AI Profit Boardroom.
What model does Codex use?
The course focuses on GPT 5.6 Sol, OpenAI’s frontier model — powerful for building and automating, though token usage is worth managing.
What can you build with Codex?
Websites, apps, automations, scheduled agents, emails, slide decks and animated videos — often in a single prompt.
Is Codex free to use?
Codex runs on your OpenAI usage, which is metered. The course also shows how to route it through free providers to cut costs — see my free Codex setup guide.
Do I need coding experience?
No — the app is built to be non-technical. You describe what you want, use plan mode, and Codex builds it, previewing locally as it goes.
The Bottom Line
A free Codex course that gets you automating real work with GPT 5.6 Sol in an hour. Start free, then step up to the full masterclass and Agent OS inside the AI Profit Boardroom.
