Copilot vs ChatGPT vs Claude: what should an SMB actually buy?
Three big names, a lot of noise, and a founder who just wants to know which one to pay for. The honest answer is that they’re good at different things — and most small businesses end up with more than one. Here’s what each is best at, how the business plans treat your data, and how to choose without overthinking it.
- Copilot wins when your work lives inside Microsoft 365 — Word, Excel, Outlook, Teams.
- ChatGPT and Claude are the strongest general assistants and the usual engines behind custom agents.
- On the business tiers, none of the three train public models on your data — the free consumer apps are the real risk.
- The right answer is usually a combination, chosen by where your work happens — not a single “winner”.
They’re not really competitors
It’s tempting to treat this as a three-way fight with one winner. In practice the tools overlap but lean in different directions, and the question that matters isn’t “which is best?” but “best at what, for whom, where?”. Get that framing right and the choice mostly makes itself.
What each one is best at
Microsoft 365 Copilot is the assistant built into the Microsoft apps you already pay for. Its advantage is context and place: it can draft in Word, analyse a spreadsheet in Excel, summarise a Teams meeting, and triage Outlook — using your own documents and emails, because it lives inside your tenant. If your team works all day in Microsoft 365, that’s hard to beat. The catch is that Copilot can surface anything a user already has permission to open, so it rewards a tidy tenant and punishes a messy one.
ChatGPT (OpenAI) is the best-known general assistant: strong at writing, brainstorming, coding help and quick analysis, with a large ecosystem and good tools for building custom assistants and agents. It’s the default “blank canvas” tool for work that isn’t tied to one app.
Claude (Anthropic) is the other leading general assistant, well regarded for careful long-form writing, working through long documents, and following instructions closely — which makes it a popular engine for agents that need to stay on the rails. For a lot of drafting and document work, teams find its output needs less tidying up.
The question isn’t “which is best?” It’s “best at what, for whom, and where does the work happen?”
A side-by-side, for an SMB
Roughly how the three compare for a typical UK small business. Treat this as orientation, not gospel — the products move fast.
| Microsoft Copilot | ChatGPT | Claude | |
|---|---|---|---|
| Best at | Work inside Microsoft 365 | General assistant & ecosystem | Long-form writing & documents |
| Lives in | Word, Excel, Outlook, Teams | Web app, mobile, API | Web app, mobile, API |
| Sees your files | Yes — within your tenant & permissions | Only what you give it | Only what you give it |
| Building agents | Improving, Microsoft-centric | Strong, large ecosystem | Strong, instruction-following |
| Business plan | M365 Copilot add-on | ChatGPT Team / Enterprise | Claude for Work |
| Best fit | Microsoft-centric teams | Mixed / general use | Writing- & document-heavy teams |
The bit that actually matters: your data
For a business, the deciding factor often isn’t capability — it’s what happens to your data. The good news is that on the business and enterprise tiers — Microsoft 365 Copilot, ChatGPT Team and Enterprise, and Claude for Work — your prompts and files are not used to train the public models, and you get admin controls and proper data handling.
The risk lives in the free consumer apps. Staff pasting customer details or contracts into a personal ChatGPT account is the AI version of shadow IT, and it’s far more common than most owners realise. The fix isn’t to ban AI — it’s to give people a sanctioned business tool so they don’t reach for an unsanctioned one.
So which should you buy?
A sensible default for most SMBs: if your work lives in Microsoft 365, start with Copilot for everyday document, email and meeting work, and add ChatGPT or Claude when you want a general assistant or an engine for custom agents. Pick the second tool by feel — trial both with a couple of real tasks and see which your team prefers.
What you shouldn’t do is buy licences for everyone and hope. The waste isn’t the subscription — it’s the seats nobody uses and the value nobody measures. That’s the part we handle in Managed AI: pick the right tool per job, get people actually using it, and keep your data out of the wrong places.
Questions we get asked.
Which is best for a small business: Copilot, ChatGPT or Claude?
It depends on where your work lives. Microsoft 365 Copilot wins when the value is inside Word, Excel, Outlook and Teams. ChatGPT and Claude win as general-purpose assistants and as the engine behind custom agents. Many SMBs end up with Copilot for everyday work plus one of the others for building automations.
Do the business plans use my data to train their models?
On the business and enterprise tiers — Microsoft 365 Copilot, ChatGPT Enterprise and Team, and Claude for Work — your prompts and files aren’t used to train the public models. The free consumer versions are a different matter, which is why staff using personal ChatGPT accounts is a real risk worth closing.
Is Microsoft Copilot worth it for an SMB?
Only if your work genuinely lives in Microsoft 365 and your permissions are tidy. Copilot surfaces anything a user can already access, so on a messy tenant it can expose oversharing. Set up properly, it’s the most natural fit for everyday document, email and meeting work.
Can we just use the free versions?
For casual personal use, fine. For company work, no — free tiers offer weaker data protection, no admin controls and no guarantee your data stays private. The cost of a business plan is small next to the risk of company data sitting in a consumer account.
Where we help.
Pick the right
tool, once.
Book 30 minutes. We’ll look at where your team’s work actually happens and tell you which AI tools are worth paying for — and which seats you can skip.