ChatGPT Business vs Microsoft 365 Copilot: which should your company pay for?

ChatGPT Business or Microsoft 365 Copilot: if your company is about to pay for AI seats, this is usually the first decision. Both give staff a capable AI assistant, both are priced per user, and both promise to keep business data out of model training. They are built for different jobs, though, and choosing the wrong one means paying for seats people do not use. This guide compares ChatGPT Business and Microsoft 365 Copilot on where your data goes, what each does best and what it costs to run, and explains when neither is enough and an AI agent is the better answer.

We write from our own work as a Microsoft partner: we license and roll out Microsoft 365 Copilot, and we build AI agents that use models from OpenAI, Anthropic, Google and open-source families, so we have no reason to push one subscription over the other.

The quick answer

If your team lives in Outlook, Teams, Word, Excel and SharePoint and most of the value is in your own documents and email, Microsoft 365 Copilot is usually the better fit. If your team needs a strong general assistant for writing, analysis, research and custom GPTs, and much of your work happens outside Microsoft 365, ChatGPT Business is often the better fit. Many companies end up with Copilot for most staff and ChatGPT Business for a smaller group of heavy users.

What ChatGPT Business and Microsoft 365 Copilot are

ChatGPT Business

ChatGPT Business is OpenAI’s plan for teams and companies, the plan OpenAI previously called ChatGPT Team. It gives each user OpenAI’s latest models in a shared workspace with admin controls, team-shared custom GPTs and connectors to tools such as cloud drives. It is a general assistant: brilliant at drafting, summarizing, analysis and brainstorming, and it works with whatever you paste in, upload or connect.

Microsoft 365 Copilot

Microsoft 365 Copilot is an add-on to Microsoft 365 business and enterprise plans. It works inside the apps your staff already use and is grounded in your organization’s data through Microsoft Graph: email, chats, meetings, files and calendars that each person is allowed to see. Microsoft explains the scope in its Microsoft 365 Copilot overview.

ChatGPT Business vs Copilot: 6 differences

	ChatGPT Business	Microsoft 365 Copilot
1. Where it works	The ChatGPT app and website, plus connectors	Inside Outlook, Teams, Word, Excel, PowerPoint and more
2. What it knows about your company	What you upload, paste or connect	Your Microsoft 365 email, files, chats and meetings, by permission
3. Best at	General writing, analysis, research, custom GPTs	Work grounded in your own documents and conversations
4. Data controls	OpenAI’s business terms and workspace admin settings	Your Microsoft 365 tenant, permissions and compliance tools
5. How it is bought	Per user from OpenAI	Per user, on top of a Microsoft 365 license
6. Takes actions in your systems	Limited, through connectors and custom GPTs	Limited, through agents and Copilot Studio

Neither one runs a business process end to end on its own. That is the job of an AI agent, which we cover below.

Where your company data goes

This is the question most buyers ask first, and both vendors give business customers stronger promises than their consumer apps.

• ChatGPT Business: OpenAI states that it does not use business workspace data to train its models by default, and admins control the workspace. Your data still leaves your environment and is processed by OpenAI, so you need to be comfortable with OpenAI’s terms and with what staff paste in.
• Microsoft 365 Copilot: prompts and responses stay within the Microsoft 365 service boundary and are covered by Microsoft’s enterprise data protection. The catch is the opposite risk: Copilot can surface anything a person already has access to, so overshared files become easy to find.

Whichever you choose, fix permissions first. Our Copilot pre-flight checklist covers the sharing and labeling checks we run before any rollout, and they are just as useful before connecting ChatGPT Business to company files.

Which tool wins for which job

Copilot tends to win

• Summarizing a long email thread or a Teams meeting you missed.
• Drafting a reply that pulls in facts from your own files.
• Turning a Word document into a PowerPoint deck, or questioning an Excel sheet.
• Finding the latest version of a policy or proposal across SharePoint.

ChatGPT Business tends to win

• Open-ended research, brainstorming and first drafts on topics outside your files.
• Data analysis on uploaded spreadsheets and charts.
• Custom GPTs shared across a team for repeated tasks, such as a style guide checker.
• Work that happens mostly outside Microsoft 365.

Inside our own company, people use AI assistants for exactly this kind of help, while the repetitive back-office processes run as agents.

What each one really costs

Both are priced per user per month, and both vendors change prices and plans often, so check current pricing before you budget. Three things matter more than the sticker price:

• Who will use it every day. A seat that is opened twice a month is expensive at any price. Start with the roles that will use it daily.
• What you already pay for. Copilot needs an eligible Microsoft 365 plan underneath it; if you already have one, Copilot builds on it.
• Rollout work. Copilot’s value depends on clean permissions and some adoption training. ChatGPT Business needs clear rules on what staff may upload.

For current Copilot plans see our guide to Copilot licenses and pricing, and for the business case behind a rollout see Copilot ROI and reducing manual work. We supply Copilot licenses through Microsoft licensing.

When neither is enough

ChatGPT Business and Copilot both help a person do their work faster. Neither takes a whole process off your team. You need an AI agent when the work looks like this:

• The same task happens many times a day: answering inquiries, sorting an inbox, matching payments.
• It touches several systems, such as your CRM, helpdesk and accounting, and needs to write to them.
• Some steps must be approved by a person, and you need a record of who approved what.
• Cost and behavior must be predictable, with a cap and an off switch.

That is how we run our own business: staff use AI assistants for everyday help, and agents run the processes in our back-office systems, with approvals in Microsoft Teams. We compare the three routes side by side on our page about Copilot, ChatGPT or an AI agent.

How to decide in 4 steps

1. List the five tasks your team would hand to AI first, and note where the information for each one lives.
2. If most of it is in Microsoft 365, pilot Copilot with a small group after a permissions check.
3. If most of it is outside Microsoft 365 or is general research and writing, pilot ChatGPT Business with clear upload rules.
4. If a task is a repeating process across systems, scope an agent for it instead of buying more seats.

A short pilot with real tasks beats any comparison table. Measure how often people use the tool and what it saves before rolling it out to everyone.

Frequently asked questions

Is ChatGPT Business the same as ChatGPT Team?

ChatGPT Business is the plan OpenAI previously called ChatGPT Team: a shared workspace for companies with admin controls and business data terms.

Is Copilot just ChatGPT inside Microsoft 365?

No. Copilot uses large language models, including models from OpenAI, but it is grounded in your Microsoft 365 data and permissions and works inside the Microsoft apps. ChatGPT Business is OpenAI’s own assistant and works with what you give it.

Can we use both?

Yes, and many companies do: Copilot for most staff who live in Microsoft 365, ChatGPT Business for a smaller group who need a strong general assistant. Set clear rules on which tool is used for which data.

Is ChatGPT Business safe for confidential data?

Its business terms are stronger than the consumer app, but data is processed outside your tenant. Decide what may be uploaded, train staff on it, and keep the most sensitive material in tools that stay inside your Microsoft 365 boundary.

Do we need IT help to roll out either one?

A small ChatGPT Business workspace can be set up in an afternoon, but someone should own the admin settings, the upload rules and who gets a seat. Copilot needs more preparation: the right Microsoft 365 licenses, a permissions and sharing review, and short training so people know what to ask. In both cases the setup is small next to the cost of seats nobody uses.

Which one is better for writing proposals?

If the proposal draws on your past proposals, case studies and pricing stored in SharePoint, Copilot can pull those facts in directly. For a first draft on a new topic, ChatGPT Business is often stronger.

Which should a small business choose?

Start from where your work lives. A small business on Microsoft 365 usually gets more from Copilot; one that works mostly outside Microsoft often gets more from ChatGPT Business. Our free AI readiness assessment can help you decide before you buy.