Copilot vs ChatGPT: Two Tests to Pick the Right AI

Every week, usually right at the end of a class, somebody asks me the same question: “We already pay for Microsoft 365, my kids use ChatGPT at home, and now my boss keeps forwarding me articles about Claude. Which one should we actually be using?” The Copilot vs ChatGPT argument, with Claude firmly in the middle of it now, is the most common thing I get asked all year, and most of the answers online are useless because they were written by somebody who does not do your job.

Here is what I have seen watching a few thousand people try all three: the winner is almost never the tool with the best benchmark scores. It is the one that sits closest to the files you already have and the software you already open at eight in the morning.

So skip the comparison charts. Run these two tests instead. Together they take about twenty minutes, they use your own work instead of somebody else’s demo data, and they will settle the argument in your office faster than any article will.

Test One: Copilot vs ChatGPT vs Claude on One Real Job

Pick something you actually did last week that took you thirty to sixty minutes and ended in writing: turning a page of messy meeting notes into a status email, summarizing a long vendor contract, drafting a policy paragraph. Do not invent a test task. The whole point is to use work you are able to judge.

Open three browser tabs: copilot.microsoft.com, chatgpt.com and claude.ai. Paste the identical prompt into all three. Use this shape:

You are writing for [who reads this]. Here are my raw notes: [paste them]. Turn this into a [status email] of about 200 words. Plain language, no marketing tone. At the end, add a short list titled "Needs confirmation" with anything you were not certain about.

That last sentence is the whole trick. All three can produce confident-sounding paragraphs. The “Needs confirmation” list shows you which one is honest about the gaps instead of quietly filling them in. Then read the three drafts and score them on one thing only: how many minutes of editing before you would actually hit send. Not which one sounds smartest. Which one is closest to done.

The gotcha: free tiers and paid tiers are completely different products, and people compare the wrong pair constantly. The free Copilot on the web is not the Microsoft 365 Copilot that reads your company files, which is a separate paid license. Run free Copilot against a paid ChatGPT account, conclude that Copilot is weak, and you have learned nothing. Write down which tier each tab is on before you declare a winner.

Test Two: See Which One Can Actually Read Your Documents

This is where the answer usually flips, and it is the test almost nobody runs. Take a question that can only be answered out of a document your company owns, something like “What is our mileage reimbursement rate for 2026, and which page of the handbook says so?” Then ask all three, and make each one prove it.

• Copilot: in the Copilot pane in Word, Teams, or on microsoft365.com, type a forward slash and start typing the file name. Copilot lists your OneDrive and SharePoint files and attaches the one you pick.
• ChatGPT: click the paperclip in the message box and attach the file, or create a Project and drop the document into the project files so it stays available across chats.
• Claude: create a Project, add the document to Project knowledge, then ask your question in any chat inside that project.

Whatever you ask, end the prompt with this line: Quote the exact sentence you used and tell me what page it is on. A tool that can quote it has read it. A tool that paraphrases and will not quote is guessing, and that tells you more than any feature chart ever will.

The gotcha: the slash picker in Copilot only sees files that live in OneDrive or SharePoint. A document sitting in a folder on your hard drive that was never synced simply will not appear, and half the people who tell me Copilot could not find their file are really telling me the file was never uploaded. Scanned PDFs are the other trap: if the pages are pictures of text rather than text, all three will struggle and you need a searchable copy first.

Plenty more on the calendar

If you would rather watch me run this side by side than do it yourself, I am teaching Copilot vs ChatGPT vs Claude: Which AI Is Best for Business? on Friday, September 25. In that session I put the same everyday business jobs through all three tools live, including summarizing a long document, cleaning up a spreadsheet, drafting client emails and building a first-draft deck, and we talk plainly about where each one falls down, what the licenses really cost, and what you should never paste into any of them.

The full current schedule is on the front page of PCWebinars.com, with new dates going up as they are confirmed. Register for this one, or browse the list and pick whichever session matches the problem sitting on your desk right now.

About your trainer

I am Tom Fragale. I have been a computer trainer and consultant for more than 30 years, and I have taught well over 30,000 people how to get more out of the software they already own: Excel, Access, Power BI, Word, Outlook, and now the AI tools that sit on top of all of it, which is to say Claude, ChatGPT, and Microsoft Copilot. My background is applied, not theoretical. Alongside the teaching I build real databases and reporting systems for clients in Excel, Access, and Power BI, so the examples I use in class are the problems I ran into last week, not textbook exercises. I also publish free tutorials on YouTube and longer courses online.

If that sounds like what your team needs, the full schedule and the rest of my training is at PCWebinars.com.