Meet your project before Codex changes it
Open the bills page with Codex in the ChatGPT desktop app, keep it on Ask for approval and check its explanation against the page.
Take over the house's bills page
Ama, Ben and Chloe share a house at 14 Fern Street and split every bill equally. Chloe built a one-page bills splitter, and she's asked you to look after it. The house, its people and the page are fictional, made for this course. Codex is OpenAI's coding agent. In the ChatGPT desktop app it's a separate view next to Chat and Work: it reads the files in a folder, changes them and runs commands. Codex is included in every ChatGPT plan, with different usage limits; on Free and Go it's offered in the desktop app only and is still reaching accounts, so it may not be on yours yet. Codex and ChatGPT Work share the same usage limits, and myoh Plus doesn't include a ChatGPT plan. Example replies in these lessons are authored illustrations, not recordings of Codex; yours will differ.
Quick check
1 of 7 steps · Take your time. · Practice is optional
Official references for this lesson
- ChatGPT Work and Codex
- Using Codex with your ChatGPT plan
- Pricing and feature availability
- How your data is used to improve model performance
- Quickstart
- Permissions
Checked against the official help pages on November 3, 2026. Tool interfaces can change.