Copilot vs ChatGPT: Which One Fits How You Work

Copilot vs ChatGPT comes down to one thing: whether your work lives in Microsoft 365. If your email, files, and meetings sit in a Microsoft work account with the full Copilot licence, Copilot can answer from them without you uploading anything. If they don't, ChatGPT is the more flexible assistant, and you lose nothing by picking it.

Three facts clear up most of the confusion:

• Copilot is not ChatGPT. Microsoft makes Copilot. OpenAI makes ChatGPT. Copilot uses OpenAI's GPT models, but it also runs Anthropic's Claude models and routes between models on its own.
• "Copilot" is several products. A free personal version, a basic work chat, and a paid work add-on that reads your organization's data. Which one you have changes the whole comparison.
• The names moved in 2026. Microsoft has renamed Microsoft 365 Copilot to Microsoft Copilot, and merged the personal and work apps into one Copilot app.

Copilot vs ChatGPT: quick comparison

Is Copilot the same as ChatGPT?

No. They are separate products from separate companies that share some of the same underlying models.

Microsoft Copilot started life as Bing Chat in February 2023 and took the Copilot name in November 2023. It was built on OpenAI's GPT models, and on the work side it still is. Microsoft now serves those GPT models two ways: through its own Azure OpenAI service, and, since July 2026, directly from OpenAI acting as a Microsoft subprocessor. Microsoft's OpenAI subprocessor page says those models "serve the same GPT-based Copilot experiences your users already have."

Then there's Claude. Microsoft now runs Anthropic models inside Copilot, on by default for most commercial customers outside the EU, EFTA, and UK. It covers Copilot chat, Researcher, Copilot Studio, and Copilot inside the Office apps. In Researcher and Edit with Copilot, you can pick Claude yourself.

By default, work Copilot doesn't make you choose at all. According to the Microsoft Copilot overview, it "uses a real-time router" to pick a model per prompt, with a quick-response mode for simple questions and a deeper reasoning mode for hard ones. There's a model selector if you want to override it.

ChatGPT is simpler on this point. It's OpenAI's own product, launched November 30, 2022, and it runs OpenAI's own GPT models. New OpenAI features land there first. Copilot picks them up on Microsoft's schedule, after Microsoft's own testing.

One naming note: GitHub Copilot is a different product again, a coding assistant licensed separately. Nothing in this comparison is about it.

Microsoft Copilot vs Microsoft 365 Copilot: which one do you have?

Most "Copilot vs ChatGPT" arguments go wrong here. People compare the free personal Copilot with ChatGPT and conclude Copilot is ChatGPT with a Bing logo. Or they compare the paid work add-on and conclude it's in another league. Both are half right.

As of September 2026, there's one Copilot app you can sign into with a personal account, a work or school account, or both. Microsoft keeps personal and work chats and data separate inside it. What you get depends on the account and licence:

Only the last row is the real differentiator. With the add-on, Copilot grounds answers in Microsoft Graph, Microsoft's index of your organization's content. And it respects the access you already have. Microsoft's privacy documentation states that Copilot "only surfaces organizational data to which individual users have at least view permissions." If you can't open a file in SharePoint, Copilot can't quote it to you either.

The flip side: if your company overshares in SharePoint, Copilot will find the overshared files. That's why Microsoft ships controls for restricting content discovery alongside it.

Where Copilot is stronger

It already knows your work. With the add-on licence, "what did we agree with the vendor last month?" works without you finding the thread first. Copilot searches your mail, meeting notes, and files and answers with citations. ChatGPT can only answer from what you give it.

It sits inside the apps you're already in. Drafting in Word, building formulas in Excel, turning a doc into a PowerPoint deck, recapping a Teams meeting. You don't switch windows or copy and paste. For the email side specifically, our guide to AI in Outlook goes feature by feature.

Your IT team can approve it. Work Copilot runs under Microsoft's existing Microsoft 365 contracts. Microsoft states that prompts, responses, and Graph data aren't used to train foundation models. Admins can switch individual model providers on or off, set retention through Purview, and see usage reports. If your company already runs on Microsoft 365, that's often what decides it before anyone compares answer quality.

You get more than one model family without extra accounts. On a work account, Copilot can hand a prompt to a GPT model or a Claude model, under one set of company terms instead of two separate subscriptions.

Where ChatGPT is stronger

It doesn't care what your company runs. If your files are in Google Drive, Notion, or Dropbox and your chat is in Slack, work Copilot's biggest advantage doesn't apply. ChatGPT works the same whatever your stack is, and it can connect to outside productivity tools.

Custom GPTs are a bigger library. OpenAI opened the GPT Store in January 2024, and there's a pre-built GPT for most niche jobs. Copilot has agents too, but custom ones are built in Copilot Studio and gated by what your admin allows.

New OpenAI releases show up here first. ChatGPT is OpenAI's own product, so its new models and features launch there. Copilot brings new models in on Microsoft's timetable, after its own testing and safety review. If you want the newest OpenAI capability the day it ships, ChatGPT is where it ships.

It remembers you across chats. ChatGPT's memory can recall facts you've told it and earlier conversations, so a personal assistant that knows your preferences is easy to set up. Work Copilot builds context from your organization's data instead, which is different.

Personal use has no licence puzzle. One sign-in, one app, and it works the same on your laptop and your phone. With Copilot, what you get depends on the account type and licence, so the right answer to "can it do X?" is often "it depends."

How to choose

Start with where your work lives, then check which Copilot you actually have.

• Your company runs Microsoft 365 and has bought the Copilot add-on for you → use Copilot for anything touching your own mail, files, and meetings. Nothing else reaches that data as easily.
• You have a work account but no add-on → Copilot Chat is a secure, web-grounded chat your IT team already approved. For everyday drafting it's close to ChatGPT. It just won't search your files on its own.
• Your work lives in Google Workspace, Notion, or Slack → ChatGPT. Copilot's big advantage doesn't apply.
• Personal use, no Microsoft 365 dependency → ChatGPT, for the GPT library, memory, and faster access to OpenAI's newest features.
• You want Claude in the mix → work Copilot offers it inside the Microsoft apps. Or compare Claude directly in our Claude vs ChatGPT breakdown.

Plenty of people use both: Copilot at work because IT approved it, ChatGPT at home. That's a sensible split, not indecision. If you want options beyond these two, our rundown of ChatGPT alternatives covers the field.

The problem neither one solves

Copilot and ChatGPT both finish tasks well. Neither leaves much behind. You get a good summary or a clean draft, the chat scrolls away, and next Monday you write the same prompt again.

That's the gap Taku works on. It's an AI-native desktop workspace where you mirror an AI app or workflow someone already got working, run it on your own files, remix it, and keep it. It isn't a replacement for either chat assistant. It's where a workflow goes when it's worth reusing. To see what that looks like, browse the free app library. Taku is in Beta, and the Mac app is available now.

Key points

• Copilot is Microsoft's. ChatGPT is OpenAI's. Copilot uses OpenAI GPT models, but on work accounts it also uses Anthropic Claude models and routes between models automatically.
• "Copilot" is several tiers. Only the paid work add-on reads your organization's data through Microsoft Graph.
• That grounding follows your existing permissions: Copilot only surfaces what you can already view.
• As of September 2026, Microsoft 365 Copilot is named Microsoft Copilot, and one Copilot app serves personal, work, and school accounts.
• ChatGPT wins on independence from your software stack, the custom GPT library, memory, and getting OpenAI's new features first.
• Choose by where your work lives, not by which model is ahead this month.

FAQ

Is Copilot the same as ChatGPT?

No. Microsoft makes Copilot and OpenAI makes ChatGPT. Copilot uses OpenAI's GPT models among others, but it has its own interface, its own data handling, and, on work accounts, Anthropic's Claude models as well.

What's the difference between Microsoft Copilot and Microsoft 365 Copilot?

Microsoft 365 Copilot was the name of the work product. Microsoft has since renamed it Microsoft Copilot, and one Copilot app now handles personal and work sign-ins with the data kept separate. The practical difference is the licence. Personal accounts and basic work chat use the web and whatever you upload. The work add-on also searches your organization's email, files, and meetings.

Is Microsoft 365 Copilot better than ChatGPT for work?

If your company runs on Microsoft 365 and you have the add-on, Copilot is better for anything involving your own work data, because it reaches that data directly and respects your existing permissions. For general drafting, research, and brainstorming, the gap is small and ChatGPT is often more flexible.

Does Copilot use GPT or Claude?

Both, on work accounts. Microsoft serves OpenAI GPT models and Anthropic Claude models in Copilot, and by default a router picks the model for each prompt. Anthropic models are off by default in the EU, EFTA, and UK unless an admin turns them on.

Can Copilot read all my company's files?

Only the ones you can already open. Microsoft states that Copilot only surfaces data you have at least view permissions for. If sharing settings are too loose, Copilot will surface what's been overshared, so permissions hygiene matters.

Is Copilot free?

A personal Copilot account includes free chat and image creation within capacity limits, and Microsoft 365 subscribers get higher limits. At work, basic Copilot Chat comes with eligible Microsoft 365 licences, while the version that reads your organization's data is a separate per-user add-on. Check Microsoft's current licensing before you plan around it.