Microsoft Copilot vs ChatGPT: Which One Fits Your Work

Microsoft Copilot and ChatGPT both draft, summarize, analyze and run agents, so the useful difference is where they get their information. Microsoft Copilot, with the full work license, reads your organization’s email, files, meetings and chats through Microsoft Graph, limited to what you are already allowed to see, and it works inside Word, Excel, Outlook and Teams. ChatGPT is a standalone assistant: it reaches your tools through apps and connectors you sign in to one at a time, which means it can work across Microsoft, Google, Slack and others, but only with what you have connected. If your work lives in Microsoft 365, Copilot starts closer to it. If it is spread across vendors, ChatGPT reaches further. Neither is better in general; this comparison reflects each vendor’s own pages as of October 1, 2026.

Which Copilot this compares

This page compares Microsoft Copilot, the assistant formerly called Microsoft 365 Copilot, and its free work tier Copilot Chat, with ChatGPT and ChatGPT Work. GitHub Copilot is a different product for writing code; for that comparison see Codex vs GitHub Copilot. For the whole Microsoft family, start with Microsoft AI tools.

At a glance

• Where it lives: Copilot is inside the Office apps and the Microsoft Copilot app. ChatGPT is its own app on web, desktop and mobile.
• Your data: Copilot reads Microsoft 365 through Graph, within your permissions, on the full license. ChatGPT reads what each connector you sign in to lets it see.
• Reach beyond one vendor: Copilot uses Microsoft Graph connectors and agents. ChatGPT uses apps and plugins for Gmail, Outlook, Google Drive, Slack and others.
• Workspaces: Copilot Notebooks and ChatGPT Projects.
• Agents: Copilot Studio, Cowork and Autopilot (in preview) on the Microsoft side; ChatGPT Work, scheduled tasks and dots (in preview) on the OpenAI side.
• Admin controls: Microsoft 365 admin center and Microsoft Purview; ChatGPT workspace settings for apps, retention and features.

Data access: Graph and permissions vs connectors

Microsoft’s page on data, privacy and security for Microsoft Copilot↗ (opens in a new tab) says Copilot only surfaces organizational data to which each user has at least view permissions, using the same access controls as the rest of Microsoft 365. That is a strength and a warning. Copilot needs no setup to find last week’s budget thread, and it will just as readily find a salary spreadsheet someone shared too widely. Teams that roll it out usually fix SharePoint permissions first.

The license decides how much of that you get. Microsoft’s overview of Microsoft Copilot↗ (opens in a new tab) sets out three tiers, still labeled with the old Microsoft 365 name. Copilot Chat on its own answers from the web and from files you upload or have open in Outlook or Teams. A middle tier adds standard access to Copilot inside Word, Excel, PowerPoint and OneNote. Only the full Microsoft Copilot license grounds answers in Graph automatically, so a team testing Copilot Chat alone has not yet seen the feature that most separates it from ChatGPT.

ChatGPT starts with nothing and adds sources. OpenAI’s admin guide to apps and connectors↗ (opens in a new tab) says each member authenticates with their own account in the external service, and ChatGPT can use a connection only when it is available to their role and that account has access. Admins can limit a connection to read-only actions and decide when ChatGPT asks before using one. The upside is reach: one assistant across Google Workspace, Microsoft 365, Slack and more. The cost is setup, one connection at a time. More on that model is in ChatGPT connectors and apps.

Where each one does the work

Copilot meets you in the document. You ask Word to rewrite a section, Excel to explain a formula, Outlook to summarize a thread, Teams to recap the meeting you missed. ChatGPT is a place you go: you bring the files or connect the sources, and it produces a draft, an analysis or a finished file. ChatGPT Work, on Enterprise and Edu workspaces with some features on Business, adds multi-step tasks that use connected apps, a cloud browser and scheduled tasks. Microsoft’s answer is Cowork, which carries out tasks across Microsoft 365 for users with the full license.

Projects and notebooks

Both keep the files and chats for one piece of work together. Copilot Notebooks answers only from the sources you add; ChatGPT Projects mixes your files with the model’s own knowledge. The full comparison, including sharing, is in Copilot Notebooks vs ChatGPT Projects vs Claude Projects.

Agents

• Microsoft Copilot: agents built in Agent Builder or Copilot Studio, published to Teams and Copilot. Autopilot, a persistent agent announced on September 25, 2026, is in private preview.
• ChatGPT: multi-step tasks in ChatGPT Work and scheduled tasks that run on a timetable or, on eligible plans, when a Gmail, Slack or GitHub event happens. Dots, always-on agents that keep working in the cloud, are in preview on some Pro, Business and Enterprise plans.
• Either way, decide what an agent may do without asking. Microsoft Copilot agents and ChatGPT agent mode cover the details.

Models

Copilot picks a model for you by default, with options for a quick response or deeper reasoning, and admins can allow models from OpenAI and Anthropic. ChatGPT lets you choose. OpenAI’s models page↗ (opens in a new tab) recommends GPT-6.1 Sol for complex work in ChatGPT Work and Codex, and says GPT-5.5 retires from ChatGPT, ChatGPT Work and Codex on October 14, 2026. Model names change often on both sides; check what your plan offers rather than comparing benchmarks.

Data controls

Microsoft says prompts, responses and data accessed through Graph are not used to train foundation models, and admins can search Copilot interactions and set retention in Microsoft Purview. OpenAI’s data governance guide for admins↗ (opens in a new tab) says it does not use business content from ChatGPT Business and Enterprise to train its models by default, and Enterprise owners can set a custom retention policy. Personal accounts on both sides are different products with different settings, so do not assume a work promise covers a personal sign-in.

Copilot or ChatGPT: pick by job

• Summarize your own meetings, email and files in Microsoft 365: Microsoft Copilot with the full license.
• Draft and rewrite inside Word or Outlook without switching apps: Copilot.
• Work across Google Workspace, Slack and Microsoft tools from one place: ChatGPT with connectors.
• Analyze a spreadsheet or build a file from scratch: either; ChatGPT if the data is outside Microsoft 365.
• Give the whole company a governed assistant with no new vendor: Copilot Chat, if you already run Microsoft 365.
• Run recurring work on a schedule: ChatGPT scheduled tasks today; Copilot Autopilot when it leaves preview.

Many teams use both, Copilot inside the Office apps and ChatGPT for work that crosses vendors. For other pairings, see Claude vs ChatGPT, Gemini vs ChatGPT and ChatGPT alternatives. For personal calendar and inbox help, see AI personal assistants.

One task list for both

If half the team uses Copilot and half uses ChatGPT, the work they produce still needs one list. fenbs is a task board where people and AI assistants are members with roles. ChatGPT connects in developer mode as an MCP app, as the ChatGPT integration shows, and Copilot connects through a Copilot Studio agent. Both read the rules on the Decisions and rules page first, file features, enhancements and bugs, and show up in History under their own names. fenbs has no due dates, reminders or settable assignee, so those go in the task note.