Microsoft Copilot vs ChatGPT for Teams: A Practical Comparison

What is being compared, and for whom

Microsoft Copilot (in its paid Microsoft 365 form, with documentation) and ChatGPT's team plans (see OpenAI's help centre) are the two options owners most often weigh when they want to give a whole team an AI assistant. They look similar at a glance, since both draft, summarise and answer questions. They are built around different ideas, and that difference decides which one suits you.

This page is for owners and office managers running teams of a few people to a few hundred, many of them on Microsoft 365. Product names, bundles and prices shift often, so check current terms before you buy.

The core difference

Copilot lives inside your Microsoft workspace. Its pitch is that it sits in Outlook, Word, Excel, PowerPoint and Teams, and can draw on your emails, calendar, meetings and files, within each person's permissions. Ask it to summarise a thread, draft a reply from a document in SharePoint, or pull the action items from a Teams meeting, and it already has the context.

ChatGPT is a standalone assistant. It sits in a browser tab or app, and you bring the material to it by pasting text or attaching files. Its pitch is a flexible general-purpose assistant with a broad toolset, saved custom assistants and a large third-party ecosystem.

One is strongest where your information already lives. The other is strongest as a flexible tool you point at whatever you hand it.

Main differences

Area	Microsoft Copilot (Microsoft 365)	ChatGPT team plans
Where it works	Inside Outlook, Word, Excel, PowerPoint, Teams	Separate app or browser tab, plus connectors
Access to your business data	Reads your Microsoft 365 content within user permissions	Only what you paste, attach or connect
Setup effort	Needs licences and clean permissions	Quick to start, light admin
Best at	Summarising meetings and email, drafting from existing files	Open-ended writing, analysis, ideas, saved assistants
Dependence on your file hygiene	High	Low
Fit for non-Microsoft shops	Weak	Strong
Admin and compliance controls	Tied to your Microsoft tenant settings	Team-level admin and data terms
Flexibility to switch	Tied to the Microsoft stack	Easy to drop or replace

What decides it in practice

Where your team spends its day. A firm running everything in Microsoft 365 gets the most from Copilot because the assistant is already in the room. A business that lives in Google Workspace, Xero, HubSpot and Slack has less reason to buy it.

How tidy your data is. Copilot is only as useful as what it can find. If your SharePoint is a decade of unsorted folders with loose sharing, it will surface the wrong things or things people should not see. Fixing permissions is useful work in its own right, and it is the right first step.

What the jobs are. If the daily friction is email volume, meeting notes and document drafting from existing files, Copilot goes straight at it. If the friction is thinking work, such as drafting proposals from scratch, analysing a pasted dataset or working through a problem, a standalone assistant is often more comfortable.

How much you want to spend per person. Both are per-seat. Buying either for everyone before testing is the usual way to waste money. Start with the few people whose work matches the tool.

A hypothetical example

Picture a ten-person accounting firm on Microsoft 365. The partners spend hours each week summarising client email threads and writing up meeting notes in Teams. A small Copilot pilot for the partners and one or two senior staff fits that pattern. The same firm's marketing coordinator, who writes newsletters and social posts and wants to brainstorm, may be better served by a standalone assistant. Many businesses end up with both, in different hands.

Data and privacy

Both vendors publish business-tier terms covering how your data is handled and whether it trains their models. Free consumer versions of either carry different terms from paid business plans. The practical rule is the same for both: decide what categories of information may go into an assistant, write that down, and make sure staff use the business account and not a personal one. For client records and anything covered by the Privacy Act or professional duties (the OAIC's guidance is the place to start), get advice on your obligations and read the current terms for the exact plan.

When each fits

• Copilot fits Microsoft-centred teams with well-organised files whose pain is email, meetings and document drafting.
• ChatGPT fits mixed-tool teams, open-ended thinking and writing work, and businesses that want to stay free to change tools.
• Both fit when different roles have different work. Keep the seat count small until usage proves itself.
• Neither fits when the task is a repeatable process across systems. That is an automation job, covered in automation vs AI agent.

See also do I need an AI policy, the guide to auditing AI tool seats and, for another assistant comparison, ChatGPT vs Claude for business.

Where 21Labs fits

21Labs is an agency in Sydney that serves businesses across Australia. We do not resell either product. We help you decide which roles get which tool, set house rules for data, and then get people using it through AI adoption, which includes training built around your own work. If you are still working out where AI belongs across the business, AI strategy is the earlier step. Discovery is free, and we reply within 24 hours.