Earlier this year I fed six months of board decks into NotebookLM and asked it what we'd been avoiding. I wrote about that experiment in a piece on using it as a strategy copilot; the answer was uncomfortable enough that the tool became a permanent part of how I prepare for big decisions. But the experiment also showed me its ceiling. NotebookLM could tell me what my documents said. It couldn't tell me what my numbers did. Summarising the quarterly figures was easy. Working out what gross margin actually did across those six quarters was still my job, back in a spreadsheet.

That ceiling is what Google has just moved. NotebookLM is now Gemini Notebook — Google announced the rename on 16 July — and the name is the smaller half of the announcement. Every notebook is getting what Google calls a secure cloud computer, which means Gemini Notebook can now write and run code against the documents you've uploaded: computation grounded in your sources, not just a well-worded summary of them. It's live for Ultra subscribers and the upper Workspace tiers, reaching Pro users on the web over the coming weeks, with new output formats to follow.

I haven't been able to try the code execution yet — it arrives by subscription tier, and like most people I'm in the queue. So read this as the promise rather than a verdict. But the promise is aimed at exactly the wall I kept hitting, and I already know the first test I'll run when it lands: margin by product line, straight from the raw exports, checked against the spreadsheet I built by hand.

What made it worth using

NotebookLM's appeal was always the constraint. It reasons only over what you upload and cites the passage behind every answer, which makes it far less prone to invention than a general chatbot — not immune, mind. The study I quoted in the strategy-copilot piece put its error rate around 13% against roughly 40% for general assistants, and the difference in kind matters more than the difference in number: its errors are interpretive, and the citations let you catch them.

That reader-mode is genuinely useful — I've also written about turning documents into presentable slide decks with it. The trouble is that many of the questions a small business most needs answered are arithmetic. Which product line is losing money. What the wage bill did as a share of revenue. Whether the Q3 dip was seasonal or structural. Answering them takes arithmetic, which reading alone can't do — and in most businesses there's a folder of exports sitting somewhere that nobody has ever properly interrogated. Until now, this tool could only read it.

The cost of a mid-adoption rename

I don't think the name matters much to Google's users, but it isn't free either, and the cost lands on a specific group: anyone mid-way through getting a team to adopt the thing. Your training notes are stale, your intranet links say one thing while the login screen says another, and the sceptics get a fresh excuse to disengage: is this the same thing or a new thing? It's the same thing. Say so early and often, update the documents, and move on.

Searchers will take longer. People will keep typing "notebooklm" for months, which is why I'm using both names here and why you should too in anything internal.

The rename does signal a direction, to be clear about what you're adopting. Notebooks now sync with the Gemini app, and Google says they're coming to AI Mode in Search, so expect your notebooks to follow you around the Google estate. Whether that's convenient or mildly claustrophobic will depend on your relationship with Google generally.

Worth doing this week

Nothing needs relearning, since every existing feature works as before, decks and audio overviews included. If you've rolled the tool out to a team, send the two-line note now: same product, new name, carry on. Check which tier you're on, because the code execution arrives by subscription level. And line up your first real question for when it reaches you. Mine is the margin one. Yours should be whichever number currently costs you an afternoon in a spreadsheet to find out.

Quick answers

Is Gemini Notebook the same product as NotebookLM, and are my notebooks safe? Yes and yes. Google renamed NotebookLM to Gemini Notebook in July 2026. Existing notebooks, sources and outputs carry over untouched, nothing about the workflow changes, and the new name and logo roll out across interfaces over several weeks.

Do the new features cost more? The rename costs nothing. Code execution is arriving by tier — Ultra and upper Workspace plans have it now; Pro users on the web follow over the coming weeks.

Why rename it at all? To fold Google's research tool into the Gemini family. Notebooks now sync with the Gemini app and are heading into AI Mode in Search.