01What is Codex and How Does It Work?

Codex course is a one-hour guide to mastering Codex, a tool inside the ChatGPT app that helps you build and automate anything. Codex lets you create websites, tools, games, and automations that run 24/7. It uses the new GPT-5.6 model, also called Sol, which is very powerful but uses tokens quickly.

Codex works by letting you give it a prompt, and it plans and builds the project for you. You can run it locally on your computer or in the cloud. It can also control your computer and connect to plugins like Gmail, presentations, and more.

This makes it easy for non-technical people to build great things without knowing how to code.

02Main Features of Codex

Codex has many features that make it a versatile tool for building and automating. Here are the key ones:

  • Build websites, tools, and games locally – You can create projects and store them in folders on your computer.
  • Computer use – Codex can control your browser and apps to do tasks like posting on social media.
  • Plugins – Connect to external apps like Gmail, presentations, GitHub, and more.
  • Scheduled tasks – Set up automations that run daily, like drafting emails or creating videos.
  • Parallel building – Work on multiple projects at the same time.
  • Plan mode – Create a detailed plan before building to get better results.

03How to Get Started with Codex

Getting started with Codex is simple. Here are the steps:

  1. Download the ChatGPT app from the official website and log in.
  2. Open Codex and create a new project folder by giving it a name.
  3. Choose to work locally or in the cloud. Local is better for most projects because you can access files easily.
  4. Decide if you want to fork the conversation to create separate branches.
  5. Use the 'do anything' section to describe what you want to build.
  6. Add files, folders, or links to give Codex context.
  7. Pick a mode: full access, ask for approval, or plan mode.
  8. Choose a model like Sol for best performance.
  9. Set the effort level – more effort gives better results but is slower.
  10. Hit enter to let Codex start planning or building.

04How to Use Codex: Examples from the Episode

In this codex course, Julian shows several examples of using Codex. He builds a website for his SEO agency, Goldie Agency, by first asking Codex to plan it. He uploads his sales proposal, brand colors, and links to give context.

Codex asks questions and creates a detailed plan.

He also uses computer use to create a social media post on a school community app. Codex opens the browser, drafts a post, and edits it when asked to add a CTA. Then it posts it.

Another example is creating a presentation about AI news. Codex builds the slide deck, then emails it using the Gmail plugin. He also creates a habit tracker app and a video using an open-source skill called Reemotion.

For the video, he pastes a GitHub link, and Codex creates a 30-second promo.

Finally, he sets up a scheduled task to research AI news and create a video daily at 3am. He reminds that the app must be open and the computer on for scheduled tasks to run.

05Results and Comparisons from the Episode

Julian tested Codex on many projects and found it to be one of the most powerful tools available. He compares Codex to using ChatGPT directly on chatgpt.com, which he says is outdated because it doesn't self-check work. Codex, on the other hand, quality controls its own work before sending it back.

He mentions that plan mode takes about 20 minutes but leads to better outputs. Speed mode makes Codex 1.5x faster, while normal mode is 50% slower. He tested the video creation and found it takes just a few seconds to edit and create, compared to a year ago when computer use was terrible.

He also notes that scheduling tasks with Codex is smooth, unlike OpenCore which often breaks. The agency website he built looked professional and didn't feel AI-generated, with real testimonials and case studies.

06Tips, Limits, and Mistakes to Avoid

To get the most out of Codex, follow these tips and avoid common mistakes:

  • Plan first – Always use plan mode for better results. Kilo Code research shows planning ahead prevents the agent from going off track.
  • Give context – The more files and details you provide, the better the output.
  • Use separate folders for new tasks – This prevents overwriting existing work.
  • Monitor token usage – Frontier models like Sol are expensive to run, so be efficient.
  • Keep your computer on for scheduled tasks – If Codex isn't open, the task won't run.
  • Save skills and workflows – Create a positive feedback loop so Codex improves over time.
  • Be careful with full access mode – It runs autonomously and may make decisions you don't like, but it will ask before deleting or replacing files.

07Who Is This Codex Course For?

This codex course is for anyone who wants to build and automate anything with AI, even without technical skills. You don't need to know Terminal or coding because Codex handles the commands for you. It's great for business owners, marketers, content creators, and anyone who wants to save time.

Using Codex, you can create websites, automations, videos, and more. Julian says it can replace a whole video team and help you be 10 times more productive. You can also sell automations to clients, as many businesses want these workflows but don't know how to implement them.

Learning Codex gives you a massive advantage in today's AI-driven world.