ChatGPT Projects vs Gemini Gems vs NotebookLM
Use ChatGPT Projects to keep one ongoing piece of work, like one client, in one place with its chats, files and instructions. Use a Gemini Gem to save instructions for a job you repeat, like "turn my notes into a client update", and open it whenever that job comes up. Use NotebookLM when the answers must come from your own documents, with citations you can click to check.
This comparison is for office staff, accountants, lawyers, insurance agents, recruiters and marketers who keep re-explaining the same background to an AI assistant. Features are as described on OpenAI's and Google's help pages as of October 2026. Free Stepthrough lessons for Projects, Gems and NotebookLM are coming; today, the free Prompt Writing 101 lesson teaches the four-part instructions all three depend on.
How do they compare at a glance?
| ChatGPT Projects | Gemini Gems | NotebookLM | |
|---|---|---|---|
| Best for | Ongoing work on one client, case or campaign | A repeat job with the same instructions every time | Questions answered only from your own sources |
| What you save | Chats, files and instructions in one workspace | A name, instructions and optional files | A notebook of sources: PDFs, websites, YouTube videos, audio, Google Docs and Slides |
| Answers cite your documents | Not its main purpose | Not its main purpose | Yes, with in-line citations |
| Files from Google Drive | Through connectors on supported plans | Yes; Gemini uses the latest version of a Drive file | Yes, Google Docs and Slides |
| Sharing | Check OpenAI's help center for your plan | You can share a Gem and chats that use it | Check Google's help pages for sharing options |
| Recent change | Included with standard ChatGPT Business seats | Google plans to move Gems to "skills" on personal accounts from November 2026 | Google's site now also calls it Gemini Notebook |
| Free Stepthrough lesson | Coming | Coming | Coming |
What is the difference between ChatGPT Projects, Gemini Gems and NotebookLM?
The difference is what each one remembers for you. A ChatGPT Project is a workspace: it groups chats, shared files and instructions so every new chat starts with the same background. A Gemini Gem is a saved assistant: a name and standing instructions, plus files if you want, that you open for one kind of task. NotebookLM is a research notebook: you add sources, and its answers are grounded in those sources with citations.
Which one should I use for client work?
For ongoing client work in ChatGPT, a Project per client keeps that client's documents and decisions together, so a follow-up email next month starts from the right context. If you live in Google Workspace, a Gem works well for the repeated part of client work, such as the same monthly update format for every client. When the question is "what does this contract, policy or report actually say?", NotebookLM is the better fit, because you can click each citation to check the source.
Whatever you choose, follow your firm's rules about client data. For accounting, law and insurance work, check what your plan does with uploaded files, keep confidential details out of personal accounts, and never treat an AI answer about a policy or contract as the final word.
What changed with Gems and NotebookLM in 2026?
Two changes are worth knowing. Google's Gems help page says Google plans to transition Gems to skills beginning in November 2026 on personal accounts, so the name and screens may change. And notebooklm.google now redirects to notebook.google, where the product is called Gemini Notebook; Google's help pages describe the same features, from sources and citations to audio overviews.
On the Google Workspace pricing page, Gemini Notebook is listed with basic access on Business Starter and expanded access on higher tiers. Check that page for what your plan includes.
Do I still need good prompts if I use Projects or Gems?
Yes. Projects and Gems save your instructions, but they don't write them for you, and vague instructions get saved just as faithfully as clear ones. The Role, Context, Task and Format pattern from the free Prompt Writing 101 lesson is a good template for project instructions or a Gem. The prompt template glossary entry explains how to turn a prompt you reuse into one.
Who is each one for?
ChatGPT Projects
For people who already use ChatGPT every day and juggle several clients, cases or campaigns. One project per client keeps files and past chats together. A free Stepthrough lesson on ChatGPT Projects is coming; meanwhile, Reply Faster: Customer Emails shows the ChatGPT basics.
Gemini Gems
For teams on Gmail and Google Docs who repeat the same writing or review job, like a weekly status update or a first read of a job description. A free Stepthrough lesson on Gems is coming.
NotebookLM
For anyone who needs answers tied to a specific set of documents: a policy manual, an engagement letter, a product guide or a stack of research. A free Stepthrough lesson on NotebookLM is coming.
Which of these tools have a free Stepthrough lesson?
- ChatGPT Projects: a free Stepthrough lesson is coming.
- Gemini Gems: a free Stepthrough lesson is coming.
- NotebookLM: a free Stepthrough lesson is coming.
Practice it free, step by step
Prompt Writing 101: Role, Context, Task, Format. Ask ChatGPT for the same customer email twice, once vaguely and once with a four-part prompt, and see exactly why structure gets a better answer. You do every step yourself in a practice copy of ChatGPT, it checks your work as you go, and “Do it for me” finishes any step you get stuck on. Free, and nothing touches your real accounts.
Start the free lessonKey takeaways
- ChatGPT Projects keep one ongoing piece of work in one place, with its chats, files and instructions.
- Gemini Gems save instructions for a repeat job; Google says Gems move to "skills" on personal accounts from November 2026.
- NotebookLM, now also called Gemini Notebook, answers from the sources you add, with in-line citations you can check.
- All three still depend on clear instructions, so learn the Role, Context, Task and Format pattern first.
Frequently asked questions
Is NotebookLM the same as Gemini Notebook?
As of October 2026, notebooklm.google redirects to notebook.google, which calls the product Gemini Notebook, and Google's help pages describe the same source-grounded notebook. Many people still search for it as NotebookLM.
Can a Gem use files from Google Drive?
Yes. Google's help page says you can add files from your device, from Google Drive or from NotebookLM notebooks, and that Gemini uses the most recent version of a Drive file.
Should I use a Project or a Gem for a repeat task?
If your team uses ChatGPT, a Project works; if it uses Gemini, a Gem is made for exactly that. The deciding factor is usually which assistant your company already uses.
Where do these prices and features come from?
Every price and feature on this page was checked against the vendor's own page, as of October 2026. No numbers here are estimates or third-party figures. The example businesses in the Stepthrough lessons are made up.
