ChatGPT vs Copilot in 2026: which fits your business?

Two tools for different questions

"ChatGPT or Copilot" sounds like a choice between two competitors, but the tools answer different questions. ChatGPT is a standalone product that runs in the browser, the app and the desktop app, next to your other software. Microsoft 365 Copilot is a layer on top of Word, Excel, Outlook and Teams that can use your own documents and mail. Copilot runs on OpenAI's latest models, and since September 2025 Microsoft also offers Anthropic models.

Which one is better is therefore the wrong question. What matters is where your team works, what you already pay for, how much you write in Office and how strict your GDPR requirements are. I use those questions as the guide below. See also the earlier guide Microsoft Copilot or ChatGPT.

Where they work

Microsoft 365 Copilot sits in Word, Excel, PowerPoint, Outlook, Teams, OneNote and SharePoint. It can use your mail, your calendar, your Teams chats and the files in SharePoint and OneDrive, as far as you are allowed to see them. Ask for a summary of last week's meeting about a project, and Copilot knows which meeting you mean without you pasting any context.

ChatGPT is a separate app. With connected apps it can search services such as Google Drive, SharePoint, Outlook, Teams and Slack, and some connections index content in advance when an administrator sets that up. Which connections are available depends on your plan and on what your administrator enables: in ChatGPT Business many apps are on by default, in Enterprise and Edu the administrator chooses. Without a connection you paste context or upload documents yourself.

So the difference is mostly in the setup. Copilot works with your files inside your Microsoft 365 environment out of the box. With ChatGPT you first set up those connections and authorise each source. For a team that spends most of the day in Office, Copilot is therefore often the shorter route: writing a quote in Word while Copilot draws on earlier quotes works without extra steps. In ChatGPT it works too once the SharePoint connection is set up.

What they are good at

Copilot is strong when your own files are the source: summarising mail in Outlook and drafting replies, rewriting Word documents with your own style as an example, formulas and analysis in your own Excel files, setting up a presentation from a short brief, summarising Teams meetings with action items, and searching the knowledge stored in SharePoint.

ChatGPT is strong when the work goes beyond your own files: brainstorming and analysis, marketing copy and social media posts, writing and debugging code, making images, talking through the voice feature, custom GPTs you share with your team, and research where ChatGPT looks up sources itself.

For many small teams it comes down to this: Copilot for the work that already happens in Office, ChatGPT for the broader creative and strategic work around it.

Price

Prices change often, so always check them on the vendor's site.

Microsoft 365 Copilot Business costs according to Microsoft $21 per user per month at the regular price on an annual subscription, for organisations of up to 300 users. It is an add-on to an existing Microsoft 365 subscription. Between 1 July and 31 December 2026 Microsoft offers a discount: $18 per user per month for the first year only, for existing customers with an eligible Microsoft 365 Business plan (as of 13 October 2026). Larger organisations have Microsoft 365 Copilot for enterprise, with its own price.

ChatGPT has plans for individuals (Go, Plus and Pro) and for organisations (Business and Enterprise). All paid plans are billed per user per month.

The biggest difference is what you already have. With Microsoft 365, Copilot is an add-on. Without it, Copilot means bringing in the whole Microsoft environment first, and the total cost goes up considerably.

Governance and oversight

Microsoft is stronger here. Copilot sits in the same admin environment as the rest of Microsoft 365: identities (Entra ID), data loss prevention, audit logs, retention policies and eDiscovery all apply. For an IT department that already manages Microsoft 365, Copilot extends what is there.

One thing to watch: Copilot only shows data a user is allowed to see. If SharePoint permissions are too broad, Copilot finds that too. Tidy up those permissions before you roll Copilot out.

ChatGPT Business and Enterprise have their own workspaces, sign-in through your company account, data settings and logs. They sit next to your IT environment, though, not inside it. For a company with ten employees that is no problem. For an organisation with a hundred or more employees and strict IT governance it takes more integration work.

Language quality

Copilot also runs on OpenAI models, so the language quality of the two is close. Both sometimes fall back on stock AI phrases. Good instructions on tone and word choice get the most out of either.

For a brand voice that suits a smaller business, more informal and direct, both need good prompts. Or pick another model: see ChatGPT vs Claude and ChatGPT in Dutch.

GDPR and where your data lives

For EU customers, Microsoft 365 Copilot is an EU Data Boundary service: traffic stays within the EU. The exception is Anthropic's models, which Microsoft says are currently outside that boundary. Prompts, responses and data from your Microsoft 365 environment are not used to train the underlying models.

OpenAI offers data residency in Europe for ChatGPT Enterprise, ChatGPT Edu and the API. OpenAI does not train on business customers' data by default. On individual plans such as Plus, you choose in the settings whether your conversations may be used to improve the models. Turn that off when you work with customer data, or better: use a business plan for that.

For work in healthcare, law or finance, where organisations often require data to stay within the EU, Copilot has the edge here. With ChatGPT you end up at Enterprise or the API.

Agents and automation

Microsoft has Copilot Studio, for building agents with little code in the Power Platform environment. It suits organisations running on Microsoft 365. Watch the billing, though: Copilot Studio charges per Copilot Credit, and one question can cost several credits. Everything about that is in the Copilot Studio guide.

OpenAI has custom GPTs and AgentKit for those who want to build agents that are not tied to Microsoft 365. For the broader approach to agents, see /ai-agents.

When to choose which

Choose Microsoft 365 Copilot if your organisation runs fully on Microsoft 365, your IT department wants tight oversight and the work happens daily in Word, Excel, Outlook and Teams.

Choose ChatGPT Business or Enterprise if the work is mostly open and creative, your team works beyond Office, you work a lot with images or voice, or you do not have Microsoft 365 and do not want it.

Choose both if you want to use AI seriously in an organisation that runs on Microsoft: Copilot for the work in Office, ChatGPT for strategic and creative work and for agents. After a trial of a few months, measure whether the extra licences pay for themselves in time.

Three situations

The situations below are examples to show the trade-off, not client cases.

A logistics company on Microsoft 365. Eighty employees who work a lot in Outlook and Excel. Copilot is the obvious choice for everyone who is in Office daily, with ChatGPT Business for a small marketing team that does a lot of image and social media work.

A communications agency on Google Workspace. Twelve employees, writing and visuals at the core. Copilot does not fit here, because the Microsoft environment is missing. ChatGPT Business for everyone makes more sense, possibly with a second model such as Claude for heavy editing work.

A notary practice with sensitive files. Microsoft 365, strict privacy requirements and confidential client documents. Copilot within the EU Data Boundary is the base. ChatGPT only as the Enterprise version, for research that does not involve client data.

Choose what fits your work

In 2026, ChatGPT versus Copilot is mostly a question of what fits your work. For many teams the two complement each other. If you first work out where the work happens, you do not have to pick a side.

Want help with the choice, a set of prompts and training for your team? See /ai-strategie for the approach and /ai-training for training. Or book a free call.