Copilot vs ChatGPT (2026): Which One Your Business Should Actually Pay For

Copilot vs ChatGPT: the short answer

If your company lives in Outlook, Teams, and SharePoint, Microsoft 365 Copilot is the better fit, at $21 a user a month on top of a Microsoft 365 Business plan ($18 as a first-year promo). If your team works across Google Workspace, Slack, and a pile of other tools, or does heavy research, writing, and analysis, ChatGPT Business is the better fit at $20 a seat billed annually. As of September 2026 the prices sit within a dollar of each other, so what you already run decides it. Prices below come from Microsoft's and OpenAI's own pages, read on September 12, 2026.

I get this question from owners about once a week, usually phrased as "which AI should we standardize on?" The honest answer is shorter than the comparison articles make it.

First, which Copilot?

"Copilot" is several different products, which is why this comparison gets muddy fast.

• Microsoft 365 Copilot Chat is the free one. Microsoft includes it at no additional cost with eligible Microsoft 365 plans, and its own FAQ says it "doesn't integrate with Microsoft 365 apps or organizational content such as files, emails, or chats."
• Microsoft 365 Copilot is the paid license that works inside Word, Excel, PowerPoint, Outlook, and Teams, grounded in your company's data. This is the one worth comparing to ChatGPT.
• GitHub Copilot is a coding assistant for developers. Different product, different decision.

There's also a consumer Copilot app, and I untangled the whole family on is Copilot free. Everything below compares paid Microsoft 365 Copilot to ChatGPT Business, because that's the decision a company actually makes.

Price: what 10 people actually pay

Per-user list prices as of September 12, 2026, multiplied out for a ten-person team:

The bundle rows are the apples-to-apples comparison, because they include the Word, Excel, PowerPoint, and Outlook apps along with Copilot. If you already pay for Microsoft 365 for email, the add-on row is your real number. If you're on Google Workspace, you'd be buying a whole Microsoft 365 plan just to get Copilot, and that's where ChatGPT gets cheap by comparison.

The full Microsoft bill, including Enterprise at $30 a user and the promo's fine print, is on Microsoft 365 Copilot pricing. OpenAI's side, including the $100 Premium seats, is on ChatGPT Business pricing.

Where Copilot wins: inside the Microsoft apps you already use

Copilot's advantage isn't the model. It's the location. Microsoft 365 Copilot sits inside the apps your team already has open all day and works from your tenant's email, files, and meetings without anyone uploading anything.

Microsoft's own comparison page (a vendor page, so read it like one) says Copilot "reasons over Teams meetings during and after the meeting," builds PowerPoint decks from your company template, and "honors existing permissions, sensitivity labels, and data loss prevention policies" because it runs inside the Microsoft 365 service boundary. It describes ChatGPT Enterprise as "a separate service outside that boundary."

That last point is the one an IT-minded owner should care about. If you've already set up permissions and sensitivity labels in SharePoint, Copilot inherits them. ChatGPT can reach the same files through connectors, and Microsoft says data reached that way "is processed outside the Microsoft 365 service boundary." Neither is wrong. It's a question of where you want your controls to live.

Where ChatGPT wins: breadth, and not caring which tools you use

ChatGPT's advantage is that it doesn't care whose software you run. OpenAI says ChatGPT Business connects to Google Workspace, Slack, GitHub, and Microsoft 365, and that ChatGPT now has more than 1,400 plugins. A company on Gmail and Slack gets a first-class experience. On Copilot, that same company is shopping for a second office suite.

The other gap is ChatGPT Work. Every Business seat includes ChatGPT, ChatGPT Work, and Codex. Work is OpenAI's agent for multi-step jobs: turning a Slack thread and a planning doc into a launch brief, comparing this quarter's pipeline spreadsheet against last week's forecast, or rebuilding a KPI report on a schedule. I broke down what it does and what it burns through on ChatGPT Work for business. For teams doing a lot of research, writing, and analysis outside Office files, that's usually the deciding feature.

A Standard ChatGPT Business seat is $20 billed annually, with a two-seat minimum and room for 2 to 200 people. OpenAI says it doesn't train on your business data by default.

Data and compliance: two different boundaries

Both vendors say they don't train on your business data. The differences are in the plumbing and the paperwork.

• Where controls live. Copilot uses your existing Microsoft 365 identity, permissions, and compliance tooling. ChatGPT Business has its own admin console, SAML SSO, and spend controls, which you manage separately.
• HIPAA. OpenAI says it doesn't offer a BAA for ChatGPT Business at all. If patient data is anywhere near this decision, read is ChatGPT HIPAA compliant before you buy either tool.
• Size. Microsoft's Business plans with Copilot cover up to 300 users. ChatGPT Business covers 2 to 200. Past those, both vendors push you to enterprise contracts.

How I'd decide for a 10-person company

Here's the order I'd run it in.

1. Check what you already pay for. If you're on an eligible Microsoft 365 plan, Copilot Chat is already included at no extra cost. Have the team use it for 30 days. It tells you whether anyone will actually use an assistant before you spend a dollar.
2. Look at where the work happens. If most of the day is Outlook, Teams meetings, and Excel files on SharePoint, buy Copilot licenses for the people who live there. If the team runs on Gmail, Slack, Notion, or a mix, buy ChatGPT Business.
3. Don't license everyone on day one. Both bill per person. Start with the five people who'll use it daily, then expand once they're hooked.
4. Running both is fine. Plenty of companies give everyone Copilot for inbox and meeting work, then give ChatGPT Business seats to the three people doing research, proposals, and analysis. Two roughly $20 bills for the right people beats one tool nobody opens.

The mistake I see most isn't picking the wrong one. It's buying either one without deciding what it's for. An assistant with no assigned jobs turns into a very expensive spellchecker in about six weeks.