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ChatGPT Business vs Microsoft 365 Copilot: which one does a small business need?
If your team works mostly in Outlook, Word, Excel and Teams, Microsoft 365 Copilot fits better because it works inside those apps. If you use Google Workspace or a mix of tools, ChatGPT Business fits better. Either way, try the free tier on real work, give paid seats only to daily users, and cut any overlap first.
The short answer
- If most of your work lives in Microsoft 365, start with Copilot.
- If you use Google Workspace or a mix of tools, start with ChatGPT Business.
- If you can’t name the task, buy neither yet.
A seat gives access, not a changed week. Someone still has to pick the task.
What each one is, in plain words
Microsoft 365 Copilot
Microsoft 365 Copilot is an add-on to a Microsoft 365 business plan, and some business plans are also sold with Copilot included. It works inside Word, Excel, PowerPoint, Outlook and Teams, using files the person can already open. Microsoft also offers Copilot Chat, included at no extra cost with eligible Microsoft 365 plans, per Microsoft. You can’t use the business Copilot add-on without a Microsoft 365 business plan. See Microsoft’s Copilot business plans page.
ChatGPT Business (formerly ChatGPT Team)
ChatGPT Business is its own workspace on the web, desktop and mobile. It can connect to work tools; see OpenAI’s business pricing page for the current list. The plan has a small minimum number of seats — the number is on the ChatGPT Business overview. OpenAI’s Help Center says business data isn’t used for training by default; read OpenAI’s own wording rather than taking our summary as a promise. ChatGPT Team was renamed ChatGPT Business on August 29, 2025; see the OpenAI Help Center.
And Gemini, if you’re on Google Workspace
If your team already uses Google Workspace, you may already have Gemini. Google’s Workspace Help says Workspace plans include access to the Gemini app and Gemini in Gmail, Docs and other Workspace apps, with features depending on the plan. Check what you already have before buying ChatGPT Business or Copilot.
Side by side
| Microsoft 365 Copilot | ChatGPT Business | |
|---|---|---|
| Works best when | Most of the week is in Outlook, Word, Excel, PowerPoint and Teams | Work lives in Google Workspace, a mix of tools, or a shared chat workspace |
| Where you use it | Inside Microsoft 365 apps, plus Microsoft’s Copilot chat | Its own app on the web, desktop and mobile |
| What you need first | A Microsoft 365 business plan | A ChatGPT Business workspace (there is a small minimum seat count; see OpenAI) |
| Sees your company files how | Through Microsoft 365 permissions the person already has | Through whatever you connect or upload, subject to OpenAI’s current setup |
| Free way to try | Copilot Chat, on eligible Microsoft 365 plans, per Microsoft | Try ChatGPT on a real task first, then move company work into a Business workspace |
| Training on your data | Microsoft says prompts and responses “are not used to train the underlying large language models.” See Microsoft’s page. | OpenAI says it “won’t train on your workspace’s data.” See the ChatGPT Business overview. |
| Biggest catch | It’s only as tidy as your file permissions, and it doesn’t help much if the work isn’t in Microsoft 365 | It sits outside the apps unless you connect them, and unused seats add up |
Prices change often. Check the current price on Microsoft’s page and OpenAI’s page.
Choose by job, not by brand
| The job | Better fit, usually |
|---|---|
| Catching up on email and meetings | Copilot, if that work is in Outlook and Teams |
| Finding a file you know exists | Copilot, if the file lives in Microsoft 365; otherwise the tool that already holds the file |
| Excel and PowerPoint work | Copilot, when the files are already in those apps |
| Gmail and Google Docs | Gemini, if it’s already in your Workspace plan; otherwise ChatGPT Business |
| Writing proposals and research | Either, once you try both on a real draft |
| Shared team instructions and a common workspace | ChatGPT Business, when you want one shared space outside a single office suite |
Where the table says “either,” pick the tool already next to the work, then try it on one real task.
Decide per person, not per company
Don’t buy a seat for every name on the payroll:
- Daily users. They have a named weekly task. A paid seat is worth considering.
- Occasional users. They draft or summarize now and then. A free tier is often enough.
- Non-users. No seat.
A 15-minute exercise usually makes this clear. List every person, the AI tool they use, how often, and for what. A made-up 12-person office might show an office manager using Copilot daily, an estimator opening ChatGPT twice a week, and several people who haven’t signed in this month. That’s a pattern, not a client story: a few daily users, some occasional ones, and seats nobody needed.
Already paying for more than one? How to cut the overlap
This is the case most comparison pages skip. One person expensed a ChatGPT plan, Microsoft added Copilot, and Google Workspace already includes Gemini. Suddenly there are two or three bills and no one can say who uses what.
Work through four steps:
- List every AI app and plan, who pays for it, and when it renews.
- Check use: who actually opened it last month, and for what.
- Find doubles: two tools doing the same job for the same person.
- Keep, drop or combine, with the person whose work it touches deciding.
Keep two tools only when named people use each one for different weekly jobs. Make any changes in your own admin accounts, and check renewal dates before you cancel. For a longer walkthrough of this kind of cleanup, see When to rightsize ChatGPT and AI tool spend.
Five system tax questions (copyable checklist)
Every AI tool a business keeps costs more than its subscription: the time, attention and cleanup it takes to keep it running. We call this the system tax. Ask these for each tool you pay for:
Five system tax questions for each AI tool we pay for [ ] 1. Are we paying for two or more tools that do the same job? [ ] 2. Who actually used each seat last month, and for what? [ ] 3. How much of our team’s time goes into keeping each tool working? [ ] 4. Where is our information ending up? [ ] 5. What would it take to leave this tool if we needed to?
The answers look different for every team, and what makes sense depends on your contracts, data rules and tools. Check those before you cancel or change anything. The decision stays with you.
The housekeeping a new seat won’t fix
- Use company accounts, not personal ones. Personal plans make it hard to remove access later.
- Remove logins for people who have left.
- Write a few plain house rules on what can go into AI tools, especially client or customer details. Check your own obligations; this is not legal or compliance advice.
- Copilot is only as tidy as your file permissions. Microsoft says Copilot uses “the same controls and permissions that help protect your data in Microsoft 365” and “follows your organization’s existing Microsoft 365 security settings.” In practice, it can surface what a person can already open. See Microsoft’s description.
When neither is the answer yet
Hold off if you can’t name the task, if the team won’t change how it works, or if the real need is one repeating chore — sorting a shared inbox, filing new requests — that a general chat seat won’t do on its own. For that last case, see Atavacron Bot Setup. If the repeating work is questions on your website, see Atavacron Chat.
How we can help
The AI Tools Checkup is a short, plain look at every AI tool your team already pays for: what’s used, where tools overlap, and whether each plan fits. You get a written report on what to keep, drop or combine, a simple 90 day plan, a walkthrough, and a follow up chat about a month later. Your team makes any changes in your own accounts. We never ask for passwords. We can’t promise you’ll save money or that your setup is safe. We tell you honestly what we found and what we’d suggest.
You can also ask Tavvy on our homepage.
Related reading
- When to rightsize ChatGPT and AI tool spend
- SMB AI consulting without enterprise bloat
- Atavacron, Tavvy, and similar names
- AI Tools Checkup · Atavacron Bot Setup · Atavacron Chat
This page is general information, not legal, financial or other professional advice. Product details come from each vendor’s own pages, checked November 10, 2026. If the vendor’s page differs, the vendor is right.
How we checked this page: we re-read the Microsoft, OpenAI and Google pages linked above on November 10, 2026, and used those pages for every vendor fact.
Questions people ask
Yes. ChatGPT Team was renamed ChatGPT Business on August 29, 2025, per the OpenAI Help Center. The rename itself did not change the plan.
For the Microsoft 365 Copilot business add-on, yes. You need a Microsoft 365 business plan first. Some Microsoft 365 business plans are also sold with Copilot included. See Microsoft’s Copilot business plans.
For many staff who only occasionally draft or summarize, yes. Microsoft says Copilot Chat “is a web-grounded AI assistant included at no additional cost with eligible Microsoft 365 plans.” Paid Copilot adds help inside apps such as Word, Excel, PowerPoint and Teams, which matters most for people who use those apps heavily. Check the current details on Microsoft’s page.
Check the Gemini access you may already have first. Google says Workspace plans include access to the Gemini app and Gemini in Gmail, Docs and other Workspace apps, with features depending on the plan. See Google’s Workspace Help. Buy ChatGPT Business or Copilot only if a named weekly task still isn’t covered.
Usually you keep the one that sits where most of your work happens and cut the other for anyone who hasn’t used it in the last month. Keep both only for named people who use each one for different jobs every week. Check renewal dates and your own contracts before you cancel anything.
No. Give paid seats to daily users with a named weekly task. Occasional users can often stay on a free tier. People who don’t use the tool don’t need a seat.
We can’t make that promise for a vendor. OpenAI’s Help Center says, of ChatGPT Business: “OpenAI won’t train on your workspace’s data.” Microsoft says of Microsoft Copilot: “Prompts and responses are not used to train the underlying large language models.” If a vendor’s page differs, the vendor is right. Read OpenAI’s wording and Microsoft’s wording yourself.
No. They sit in different places and see your work differently. Copilot is built to work inside Microsoft 365 apps and can use files a person can already open. ChatGPT Business is its own workspace, with optional connections to work tools. We don’t claim which model sits underneath either product.
No tool can guarantee that. A seat gives access. Time comes back only when a named task actually moves, and someone on your team still has to use it.