Copilot in Excel vs ChatGPT for Data Analysis: Which One Should You Use?

Two AI tools now want to help with your spreadsheet, and they could hardly be more different in philosophy. Microsoft’s Copilot lives inside Excel and edits the workbook in front of you; OpenAI’s ChatGPT waits in a browser tab for you to bring it a file. Both write formulas, both build charts, both claim to find insights — so which should you actually use, and for what? The answer depends on where your data lives, how your work flows, and what a mistake would cost you. This comparison works through the two tools task by task, using the makers’ own documentation as the ground truth: Microsoft’s Copilot in Excel guide and OpenAI’s data analysis documentation. No benchmarks, no vibes — just what each tool verifiably does, where each one is available, and the jobs each is genuinely better at.

How each one works

Copilot in Excel is an operator. Microsoft describes it completing requests using Excel’s own tools — tables, charts, PivotTables and formulas — with the results staying native and editable. It has three modes: edit (it changes the workbook), plan (it proposes steps for your approval first) and chat (it analyses and answers without touching anything). When you submit a prompt in edit mode, Microsoft says Copilot creates a step-by-step plan, carries it out in the workbook, reviews the outcome against your intent, and shows its reasoning as it goes. ChatGPT’s data analysis is an analyst-for-hire. You upload a spreadsheet — OpenAI supports .xls, .xlsx and .csv among other formats — and it inspects the file, answers questions, and creates tables and charts, running code in a secure sandbox to do calculations. The output comes back as answers, visuals and downloadable files. Your original workbook is never modified, because the tool never sees it — only the copy you sent.

Task by task

Writing formulas. Both are strong; the difference is delivery. Copilot can apply the formula into the grid across sheets, and its chat mode will explain suggestions before anything changes. ChatGPT produces the formula as text for you to paste — one extra step, but the explanation-first flow makes it the better teacher, as our formula guide shows. Cleaning data. ChatGPT’s code sandbox gives it the edge for ugly one-off files: it can reshape, split, merge and standardise an exported CSV and hand back a clean file, following the workflow in our cleaning guide. Copilot counters with in-place reshaping and merging across sheets in edit mode — better when the workbook is a living document rather than an export. Charts and PivotTables. Copilot builds real, editable PivotTables and charts wired to your source data, which matters when the numbers will change next week. ChatGPT’s charts are images and outputs of a moment — excellent for a report, dead the moment the data moves. Insights and questions. Microsoft says Copilot surfaces insights as charts, PivotTables, summaries, trends or outliers, and can also fetch web information to ground an answer. ChatGPT is the more conversational interrogator and will happily explain its method step by step. Working across files. Copilot can import data from other workbooks in OneDrive or SharePoint; ChatGPT can attach files from connected sources such as Google Drive, OneDrive and SharePoint where your plan allows — and its sandbox cannot browse the web mid-analysis, so outside data must be supplied.

Access, platforms and cost shape

Availability draws the sharpest line. Microsoft is blunt: if Copilot does not appear in Excel, it likely is not included in your Microsoft 365 subscription — full Copilot in Excel requires an eligible plan with a Copilot licence, an add-on cost on top of Microsoft 365. Where you do have it, it spans Windows, Mac, web, iPad, iPhone and Android, though modes vary: edit mode is a desktop-and-web strength, while iPhone and Android are listed with chat mode and editing still rolling out. ChatGPT’s analysis is plan-based too — file uploads exist across Free and paid plans with plan-specific limits, per OpenAI’s upload documentation — and it runs anywhere a browser or the ChatGPT app does. The third option blurs the map: OpenAI documents ChatGPT working inside Excel and Google Sheets as a sidebar where a workspace enables the add-in, which gives upload-style conversation without leaving the workbook. In practice: organisations already paying for Microsoft 365 Copilot licences get the integrated tool by default; everyone else starts with ChatGPT and upgrades only when the export-upload shuffle becomes the bottleneck.

The privacy and control difference

Where your numbers travel is a real decision, not fine print. Copilot operates inside your Microsoft 365 tenant: the workbook stays in OneDrive or SharePoint, edits happen through Excel’s own features, and plan mode plus the visible step-by-step reasoning give you checkpoints before and during changes — with Stop available mid-task. The risk profile is action risk: an edit-mode mistake lands directly in your live file, which is why version history and plan mode matter. ChatGPT’s profile is copy risk: your live file is perfectly safe — nothing can touch it — but a copy of your data now exists in a chat, subject to your plan’s data controls and your organisation’s policies. OpenAI’s guidance is also a reminder that the sandbox works only with what you give it; sensitive columns you did not mean to share travel with the file unless you strip them first. Neither profile is “the safe one.” The right question is which mistake you would rather manage: an over-eager edit you can undo, or a data copy you must govern. Teams in regulated environments usually answer that question at policy level, which settles the tool choice before features are even compared.

So which should you use?

Use Copilot if your spreadsheet is a place, not an event — the weekly sales workbook, the standing budget model, the tracker the team shares — and your organisation already holds the licences; in-place editing, live PivotTables and plan-mode checkpoints fit recurring work. Use ChatGPT if your spreadsheet work arrives as events: a supplier’s strange export, a one-off survey to summarise, a dataset to explore before deciding it deserves a workbook at all. Use both if you can: ChatGPT as the sandbox where messy questions get prototyped safely, Copilot as the workshop where proven changes get applied to the real file. That division — experiment on copies, commit in place — is the mature pattern, and it mirrors the checking discipline in our pillar guide, AI for Excel and Data. Readers weighing the wider assistant landscape should also see how these two compare as general chatbots in ChatGPT vs Claude vs Gemini.

Side by side

What this means

Comparisons like this one used to be decided by feature lists; this one will be decided by gravity. Microsoft owns the place where the world’s spreadsheets already live, and Copilot’s advantage is not intelligence but location — no exports, no uploads, no context-switch, the AI simply present in the grid. OpenAI’s counter-advantage is freedom: ChatGPT meets data wherever it sits, in whatever tool produced it, and its code-running analysis is genuinely the more powerful instrument for irregular, one-off questions. For US readers, the practical consequence is a two-tool era rather than a winner: the same person will interrogate a CSV in ChatGPT on Monday and let Copilot rebuild the standing budget workbook on Friday, choosing by where the data lives that day. Vendors know it — hence ChatGPT appearing inside Excel as a sidebar, and Copilot learning to fetch from the web like a chatbot. The durable skill is not loyalty to either; it is knowing which kind of risk you are holding — an edit you must supervise, or a copy you must govern — and matching the tool to the task in front of you. Feature lists will keep changing quarterly. That judgement will not expire.

One more force will shape this contest, and it is procurement rather than technology. For most employees, the choice between these tools will be made by an IT department weighing tenant controls, data-residency and licence bundles — which is why Copilot’s position inside Microsoft 365 agreements matters more than any feature comparison, and why ChatGPT’s path into Excel as an add-in matters more than its benchmark scores. Individuals choosing for themselves should read that correctly: you are not picking a winner in a finished race, you are renting capability in a market whose prices, bundles and boundaries will keep moving. The robust strategy is the one this comparison keeps landing on — keep your data clean and portable, keep your verification habits tool-agnostic, and let each job pick its instrument. Loyalty is for football teams. Spreadsheet AI is a toolbox.

Bottom line

If your work lives in Excel all day, Copilot’s in-place editing keeps everything native and is the natural fit. If your pain is the occasional ugly export that needs reshaping before anyone can analyse it, ChatGPT’s sandbox analyst is the stronger tool. Plenty of people will end up using both — Copilot for the workbook in front of them, ChatGPT for the file nobody wants to touch.

Read Next

• AI for Excel and Data: How AI Helps With Spreadsheets, From Formulas to Full Analysis
• How to Turn Spreadsheet Data Into Charts and Insights With AI

Sources

• Get started with Copilot in Excel — Microsoft Support (accessed 7 November 2026)
• Data analysis with ChatGPT — OpenAI Help Center (accessed 7 November 2026)
• Analyzing data with ChatGPT — OpenAI Academy (accessed 7 November 2026)