What is the difference between ChatGPT and Microsoft Copilot?

ChatGPT is a standalone product, separate from your work environment, that lives in the browser, app and plug-ins. Microsoft 365 Copilot is a layer on top of your existing Office (Word, Excel, Outlook, Teams) that knows your own documents and mail. Under the hood partly the same model, but they answer a different question.

Which is better for SMEs: ChatGPT or Copilot?

It depends on where you work. If you live in Microsoft 365 and write a lot in Office, Copilot pulls value directly from your own documents. Want breadth (images, brainstorming, one-off tasks, plug-ins) separate from Office, then ChatGPT is more versatile. The question is not which is better, but in which environment you work.

Does Microsoft Copilot work without Microsoft 365?

The strength of 365 Copilot lies precisely in the integration with Word, Excel, Outlook, Teams and SharePoint, so without Microsoft 365 the biggest advantage falls away. If you don't work in the Microsoft environment, ChatGPT (or Claude) is almost always the more logical choice.

Which is safer in terms of GDPR?

Copilot runs within your Microsoft 365 tenant with the governance you already have there, which makes it easier for many organisations to be GDPR compliant. ChatGPT requires a Team or Enterprise account and attention to where customer data goes. Both can be used responsibly, provided you don't use the free consumer tier.

ChatGPT vs Copilot in 2026: which fits your business?

ChatGPT and Microsoft Copilot aren't the same fight

The comparison most SME leaders make is off. "ChatGPT or Copilot" reads like two rivals on the same battlefield. They're different answers to different questions. ChatGPT is a standalone product, separate from your work environment, living in browsers, mobile apps and plug-ins. Microsoft 365 Copilot is a layer on top of your existing Office. Under the hood they partly share the same GPT-4 model, but the question they answer is fundamentally different.

That difference decides everything. The relevant questions for an organisation aren't "which is better", but: where do you work today, what have you already paid for, how often do you write in Office, and how strict are your GDPR requirements? This piece compares honestly using those questions as the compass. For the earlier guide, see also Microsoft Copilot or ChatGPT.

Where do they live?

Microsoft 365 Copilot lives in Word, Excel, PowerPoint, Outlook, Teams, OneNote and SharePoint. It sees your emails, your calendar, your Teams chats and the files in SharePoint and OneDrive. Ask "summarise last week's discussion on project Apollo" and it understands which discussion you mean without you pasting context.

ChatGPT (Plus, Team, Enterprise) is a separate web and desktop app. It doesn't know your files on its own. You paste context, upload documents, or connect through the API and plug-ins. It's more general and broader, but not natively embedded in how you work.

For an SME team that spends eighty percent of the day inside Office, that difference is decisive. Writing a proposal in Word while it pulls from your earlier proposals saves half an hour per document. The same task in ChatGPT means pasting the relevant context every single time.

Where are they strong?

Copilot is strong wherever your Office data is the source itself: summarising Outlook mails and drafting replies, rewriting Word documents using your earlier style as a reference, Excel formulas and analysis on your own sheets, building PowerPoint decks from a short brief, summarising Teams meetings with action points and owners, and searching across your entire company knowledge in SharePoint. All tasks where the value comes from files that already exist.

ChatGPT is strong where you need to work open and creatively without your internal data being the source. Brainstorming and strategic analysis, marketing copy and social posts, writing and debugging code (especially through the API or Codex features), image generation via DALL-E, voice mode for spoken use, custom GPTs you share with your team, broad research through tools and plug-ins. It's wider and rougher, but it wins where the world outside your SharePoint matters more than the one inside.

For most SME teams: Copilot for work that already happens in Office, ChatGPT for the broader creative and strategic work around it.

Price

Microsoft 365 Copilot costs around USD 30 per user per month, on top of your existing M365 E3 or E5 licence. So a team of ten runs about USD 300 per month for Copilot, plus the M365 base you were already paying for. Microsoft now has lighter variants like Copilot Pro for individual users and Copilot Business; check current pricing, because Microsoft keeps shifting it around.

ChatGPT Team sits at USD 25-30 per user per month. ChatGPT Enterprise is custom, usually higher. ChatGPT Plus for individual users: USD 20 per month.

The raw tool price is roughly the same. The difference sits in the M365 assumption. Already on M365 E3 or E5? Then Copilot is an add-on. No M365 at all? Then you can't buy Copilot without bringing in the whole Microsoft environment first, and total cost climbs fast.

Governance

Microsoft wins here. Copilot sits in the same admin layer as the rest of M365. Identity (Entra ID), DLP, audit logs, retention policy and eDiscovery all work with it. For IT teams that already lean fully on M365 management, Copilot is an extension of existing controls.

ChatGPT Team and Enterprise have workspaces, SSO, data controls (no training on your data) and audit logs, but it sits next to your existing IT environment, not inside it. For a ten-person SME that's no issue. For an organisation of 100+ people with strict IT governance, it takes more integration work.

Language quality

Both models run on GPT-4 (and successors) under the hood. Language quality is comparable. In practice, customers notice Copilot writes a bit more formal and businesslike (fitting the Office context), while ChatGPT is looser and more varied. Both carry the familiar ChatGPT tics ("leverage", "stakeholder") that good prompts can dial back.

For a brand voice that fits smaller businesses (more informal, direct, regional where it fits), both systems need deliberate prompting. Or you pick a different model: see ChatGPT vs Claude for the Claude comparison, and ChatGPT in Dutch for the broader context.

Microsoft 365 Copilot runs by default on Azure with EU data storage for business customers. GDPR-compliant out of the box, no configuration, for M365 E3/E5 environments. For SMEs worried about data sovereignty, that saves time and contract work.

ChatGPT sits in the US by default. EU data storage has existed since 2025, but only on ChatGPT Enterprise, ChatGPT Edu and the API. For ChatGPT Plus and Team, hosting stays in the US by default. Recently, input on Plus is no longer used to train the model, which reduces one concern, but it doesn't change where the data physically sits.

For healthcare, legal or financial work where data residency is a hard requirement, Copilot wins on the default version. ChatGPT requires the Enterprise tier or use through the API.

Agents and automation

Microsoft has Copilot Studio (low-code agents in Power Platform). Good for organisations on M365, with some pitfalls around per-message billing and how far the agent capability actually reaches. Full breakdown in the Copilot Studio guide.

OpenAI has GPTs (custom assistants), AgentKit and Operator. A broader ecosystem for anyone building agents not tied to M365. For deeper agent workflows with custom tools and data, ChatGPT is currently a step ahead.

For the broader agent approach see /ai-agents.

ChatGPT and Copilot aren't rivals on the same battlefield. They're different answers to different questions.

When do you pick which?

Pick Microsoft 365 Copilot if your organisation runs fully on M365, your IT team wants tight oversight, and daily work happens in Word, Excel, Outlook and Teams. Copilot pays for itself within three months in the time you save inside Office.

Pick ChatGPT (Team or Enterprise) if your work is largely open and creative, your team ranges wider than Office, you need a lot of image generation or voice AI, or you have no M365 environment and don't want one.

Pick both if you're serious about AI in a Microsoft organisation. Many of my clients use Copilot for Office work and ChatGPT Team alongside it for strategic, creative and agent work. The extra USD 20-30 per user is negligible against the productivity gain.

Three scenarios from client work

A logistics SME. Fully on M365, 80 employees, heavily reliant on Outlook and Excel. Copilot for anyone actively working in Office, plus ChatGPT Team for the five-person marketing team doing a lot of image work and social posts. Total: 80 Copilot licences and 5 ChatGPT Team seats. The investment pays back within four months, on Outlook summaries alone.

A small communications agency. No M365 (runs on Google Workspace), 12 employees, writing and visuals are the core. ChatGPT Team for everyone, plus Claude Pro alongside for the seniors doing heavier editorial work. Copilot plays no role because the M365 environment isn't there. Not a problem: the tool should fit the work, not the other way around.

A notary firm. M365 environment, strict GDPR requirements, sensitive client documents. Copilot with EU data storage from M365 is the base. ChatGPT only on the Enterprise tier for specific research tasks that fall outside their own data. No ChatGPT Plus or Team, where US hosting is still the default.

Not a religious choice

ChatGPT vs Copilot in 2026 is less a choice between rivals than a question of what fits your work. Most DataDream clients experience both tools as complementary, not replacing each other. The real question isn't "which model is better", but "where does our work happen and which model solves that". Whoever answers that first doesn't have to pick a camp.

Want help choosing your setup, a library of prompts and training for your team? See /ai-strategie for the approach and /ai-training for building the skills. For a free scan of your use cases: book a free call.

Curious what AI can do for your business?

Take the free AI Scan and find out in 1 minute.

Start the AI Scan

Frequently asked questions

What is the difference between ChatGPT and Microsoft Copilot?: ChatGPT is a standalone product, separate from your work environment, that lives in the browser, app and plug-ins. Microsoft 365 Copilot is a layer on top of your existing Office (Word, Excel, Outlook, Teams) that knows your own documents and mail. Under the hood partly the same model, but they answer a different question.
Which is better for SMEs: ChatGPT or Copilot?: It depends on where you work. If you live in Microsoft 365 and write a lot in Office, Copilot pulls value directly from your own documents. Want breadth (images, brainstorming, one-off tasks, plug-ins) separate from Office, then ChatGPT is more versatile. The question is not which is better, but in which environment you work.
Does Microsoft Copilot work without Microsoft 365?: The strength of 365 Copilot lies precisely in the integration with Word, Excel, Outlook, Teams and SharePoint, so without Microsoft 365 the biggest advantage falls away. If you don't work in the Microsoft environment, ChatGPT (or Claude) is almost always the more logical choice.
Which is safer in terms of GDPR?: Copilot runs within your Microsoft 365 tenant with the governance you already have there, which makes it easier for many organisations to be GDPR compliant. ChatGPT requires a Team or Enterprise account and attention to where customer data goes. Both can be used responsibly, provided you don't use the free consumer tier.