Codex CLI in VS Code, a beginner-friendly guide

What "Codex CLI" is in VS Code

Codex is OpenAI's coding agent. Think of it as a helper that can do work inside your project, not just talk about it.

You can use Codex in two connected ways.

Codex in the VS Code extension

So you can work side-by-side with your code in the editor.

Codex in the terminal as the CLI

So it can read files, update files, and run commands in the folder you are working in.

Why it matters if you already have ChatGPT

Browser ChatGPT can suggest code and explain errors. Codex can act on your project folder.

That means Codex can:

Look at your real files and folders
Update more than one file in a single change
Run your normal commands like start, build, or test
Show you what changed, then keep fixing issues if something fails

What it is best for, in plain language

Changes that would normally take lots of clicking around

Example: You add a new page or feature and now you need to update a few different files to connect it all. Codex can handle that kind of "update all the connected pieces" work.

Fixing errors by actually running the project

This is the big one. Instead of copying an error message into a chat, Codex can run the command, see the error, try a fix, then run it again until it works.

Packaging interactive learning assets consistently

If you build small web interactions you drop into another tool, you usually need the same output every time, like a clean folder with the right files.

Codex can help you create a single command that:

builds your interaction
copies the right assets
outputs a clean folder you can reuse over and over

Simple checks that prevent "I did everything right, why is it broken"

Codex can add little checks that stop problems early, like:

"These images must exist and be named correctly"
"This CSV must include these columns"
"If something is missing, show a clear message and stop"

This saves you from confusing failures later.

Plans and access

Codex is included with ChatGPT Plus, Pro, Business, Edu, and Enterprise plans.

Where to install it and how to add it to VS Code

For the latest installation instructions, check out these official resources:

If you are on Windows: OpenAI describes Windows support for the IDE extension as experimental and recommends using WSL for the best experience.

Beginner prompts you can copy and paste

Use these in the Codex panel or in the terminal while you are in your project folder.

"Explain what this project does and how I run it."

"Run the project, then tell me what failed in plain language."

"Make a single command that outputs a clean folder I can share."

"Add a check that warns me if required file names are missing."

The simple takeaway

Codex in VS Code matters because it can do the work inside your project folder, then run it, instead of making you bounce between tools and manually copy changes around.

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