How do you check where an AI-filled spreadsheet cell got its answer — and why should you?

Fill with Gemini in Google Sheets now shows web-source citations inside individual AI-generated cells and can handle requests of up to 3,000 cells. Here is how to open the citation view and audit an AI-filled number before it flows into a budget or an order.

Short answer: when Gemini fills a Google Sheets cell from the web, that cell now carries its sources with it. Open the cell’s citation view and you can see which web pages the answer came from — and check them before you trust the number. Google’s update to Fill with Gemini, which began rolling out on October 20, 2026 and was announced on October 28, adds web-source citations inside individual AI-generated cells, and raises a single request to as many as 3,000 cells.

It is available on eligible Workspace plans, including Business Standard and Plus.Why it matters: an AI-filled cell looks exactly like a fact you typed yourself. Nothing about its tidy formatting tells you whether the price, date or spec is right — and a wrong value does not stay in one cell. It flows quietly into totals, budgets, purchase orders and customer quotes.

The citation view is the audit trail that was missing: it turns “the AI said so” into “here is the page it read,” which you can open and compare.How to check an AI-filled cell, step by step:1. Open the sheet and find the cells Gemini filled — treat every one of them as unverified until you have looked.2. Select the AI-filled cell or range you want to audit, starting with any figure other numbers depend on.3.

Open the cell’s source or citation view to see the web pages Gemini used for that specific cell.4. Open at least the top source and compare the number, date or spec on the page with what landed in the cell. If they differ, the cell loses.5.

Re-check high-stakes cells by hand — anything feeding a budget, an invoice or a customer-facing price deserves a manual look, citation or not.6. Make spot-checking the rule: never let AI fill financial or customer-facing figures without a human checking a sample first.Common mistake: treating a filled cell as verified just because it looks tidy. Neatness is formatting, not evidence — the citation is the evidence, and only if you open it.