PromptivityChat, Work or Codex? A Plain Guide to Choosing the Right ChatGPT Mode
by Promptivity
$9
Not affiliated with or endorsed by OpenAI. ChatGPT and Codex are trademarks of OpenAI.
ChatGPT now gives you Chat, Work and Codex in one place, and they overlap. This guide answers which one to open, in plain words.
One question does most of the work: is this a reply, a piece of work, or code? The guide shows you how to apply it, with worked examples and common mistakes to avoid.
What's inside
- The three tools in plain words, and where Plan mode fits.
- How to switch between them on desktop and phone.
- A decision table: ten common jobs and which tool to use.
- Eight worked examples.
- Common mistakes.
- A six-point checklist for briefing Work.
- A one-page cheat sheet.
Format
A 7-page PDF. Product details were checked against OpenAI's help and product pages on 17 October 2026. What you can see depends on your plan, your device and, at a company, your admin's settings.
Who it's for
- You use ChatGPT and you're not sure when to switch to Work.
- You've seen Codex and wondered whether you should be using it.
- You want a simple rule you can apply without reading release notes.
It's not a coding tutorial.
Questions
What do I get?
A 7-page PDF guide. The three tools in plain words, a decision table of ten common jobs, eight worked examples, common mistakes, a six-point checklist for briefing Work, and a one-page cheat sheet.
What format is it?
A PDF, 7 pages, version 1.0.2.
How do I get it after I buy?
It costs $9. You pay on Gumroad, and the PDF is an instant download through Gumroad after purchase.
What if it isn't right for me?
You get a 14-day, no-questions-asked refund. Email support@promptivity.ai within 14 days of buying.
Is this made by OpenAI?
No. Promptivity makes these guides. ChatGPT is a trademark of OpenAI; not affiliated.
Checkout and delivery are handled by Gumroad. Every guide comes with a 14-day, no-questions-asked refund.