ChatGPT is a standalone AI assistant you go to in a browser, with the widest range of features. Microsoft Copilot is AI built into the Microsoft 365 apps you already use, so it works inside Word, Excel, Outlook and Teams with access to your company files.
If your business lives in Microsoft 365, Copilot removes friction. If you want the most capable general tool and flexibility, ChatGPT wins. Plenty of businesses sensibly use both.
On paper these two look like rivals. In practice they do slightly different jobs, and picking between them is less about which is "better" and more about where your work already happens. Get that straight and the choice makes itself.
The core difference in one line
ChatGPT is a destination. You go to it, in a browser or app, ask it things, and it does them. It is a Swiss Army knife that sits outside your normal software. Copilot is a passenger. It rides along inside Word, Excel, Outlook, Teams and the rest of Microsoft 365, so the help appears where you already are, and it can see the documents and emails you have permission to see.
| ChatGPT | Microsoft Copilot | |
|---|---|---|
| Where it lives | A separate app / website | Inside Word, Excel, Outlook, Teams |
| Sees your company files | Only what you paste in | Yes, what you have access to in 365 |
| Best at | Broad tasks, ideas, images, flexibility | Drafting and summarising inside your work |
| Range of features | Widest (voice, images, custom GPTs) | Focused on Office productivity |
| Ideal user | Anyone wanting a powerful general tool | A team already on Microsoft 365 |
| Rough cost | ~£17 / user / month | ~£19 / user / month add-on to 365 |
Where Copilot shines
If your day is spent in Outlook and Excel, Copilot's big advantage is that it already knows your context. Ask it to summarise the email thread you are looking at, draft a reply in the tone of your last one, build a formula, or turn a spreadsheet into a chart and a paragraph of commentary, and it does so without you copying anything anywhere. That "no copy-paste, it can see my stuff" factor is genuinely useful, and it keeps company data inside your Microsoft tenant.
Where ChatGPT shines
ChatGPT is the more capable and flexible tool in the open. It handles images, voice, longer creative tasks, and a huge range of jobs that have nothing to do with Office. It is often a step ahead on raw capability, and you can build little custom versions for specific tasks. The trade-off is that it does not see your business files unless you show them to it, which for some data is exactly what you want anyway.
Quick decision guide
- Deep in Microsoft 365 all day? Copilot, for the zero-friction fit
- Want the most powerful, flexible tool? ChatGPT
- Care most about writing quality? Consider Claude alongside both
- Handle sensitive files? Copilot keeps data in your 365 tenant; check settings either way
- Budget for one only? Match the tool to where your work already lives
Get your team fluent in the right tool
We run dedicated deep dives on ChatGPT, Copilot, Claude and Gemini, built around your real tasks.
The 'why not both' answer
In reality, many businesses end up using both, and that is not indulgent. Copilot handles the in-flow productivity inside Office, and ChatGPT handles the bigger, more creative or one-off jobs. If you are starting out, though, do not spread yourself thin. Pick the one that matches where your work lives, get properly good, and add the second only when you feel its absence.
Whichever you choose, the tool is only half the story. A team trained to brief it well and check its work gets three times the value of a team handed a login and left to guess. If you want help deciding and then embedding it, our AI stack sessions are built for exactly that.
Frequently asked questions
Is Copilot just ChatGPT inside Microsoft?
They share underlying AI technology, but they are different products. Copilot is integrated into Microsoft 365 and can work with your company files; ChatGPT is a standalone, more flexible tool that only sees what you give it.
Which is better for a small business, ChatGPT or Copilot?
It depends on your setup. If you already pay for Microsoft 365, Copilot fits neatly and keeps data in your tenant. If not, or if you want the most capable general tool, ChatGPT is the stronger pick.
Can I use both ChatGPT and Copilot?
Yes, and many businesses do. Copilot handles work inside Office apps, while ChatGPT covers broader and more creative tasks. If budget is tight, start with the one that matches where you work.
Does Copilot keep my data more private than ChatGPT?
Copilot on a business plan keeps data within your Microsoft 365 tenant and does not train on it. ChatGPT's business tiers also don't train on your data by default. With either, check the settings and use business, not free consumer, versions.
How much do ChatGPT and Copilot cost?
Both sit around £17 to £19 per user per month, with Copilot as an add-on to a Microsoft 365 licence. There are free tiers of each for testing before you commit.