For most Microsoft 365 companies, Microsoft Copilot is the natural default: it works inside Word, Excel, Outlook, and Teams and grounds answers in data each employee can already access. ChatGPT Enterprise is the stronger standalone workspace for custom GPTs, agents, and Codex. Many firms run both. Either way, enablement decides adoption more than the platform does.
Clustr trains on both platforms, so this page has no horse in the race. Every product claim below links to the vendor's own public page, checked on September 26, 2026. Vendors change these products often, so confirm the details with them before you sign. For all four major platforms side by side, see Copilot vs ChatGPT vs Claude vs Gemini.
Updated September 2026
Microsoft has renamed Microsoft 365 Copilot to Microsoft Copilot, and says some licenses will keep the old name during the transition (Microsoft Learn). This table uses the new name.
Microsoft Copilot | ChatGPT Enterprise | |
|---|---|---|
| Where it lives | Built into Word, Excel, PowerPoint, Outlook, and Teams, plus Copilot Chat on the web and in the Microsoft Copilot app (Microsoft, Microsoft Learn). | A dedicated ChatGPT workspace for your organization. Standard seats include GPTs, Projects, apps, Company Knowledge, ChatGPT agent, deep research, and Codex (OpenAI Help). |
| Microsoft 365 data | With a Copilot license, answers are grounded in Microsoft Graph content such as emails, chats, documents, calendar, and meetings the user has permission to see (Microsoft Learn). | Connects through apps: SharePoint and OneDrive for work or school, plus Outlook email and calendar. A workspace admin enables them and a Microsoft Entra admin grants the permissions (SharePoint, Outlook). |
| Permissions | Only surfaces organizational data the individual user can already view, so SharePoint permission hygiene matters (Microsoft Learn). | Only retrieves content the connected Microsoft account can already access; admins can also allowlist or deny SharePoint sites (OpenAI Help). |
| Model training | Prompts, responses, and data accessed through Microsoft Graph are not used to train foundation models (Microsoft Learn). | Business data is not used to train OpenAI models by default, and you own your inputs and outputs where allowed by law (OpenAI). |
| Data handling | Covered by existing Microsoft 365 commitments including GDPR and the EU Data Boundary; admins set retention for Copilot interactions in Microsoft Purview (Microsoft Learn). | SOC 2 audit, AES-256 encryption at rest, TLS 1.2+ in transit, and admin control over how long data is retained (OpenAI). |
| Admin controls | Copilot controls cover security and governance, management (licensing, agent lifecycle), and measurement through Copilot Analytics (Microsoft Learn). Admins choose which agents are allowed (Microsoft Learn). | SSO, SCIM, domain verification, and usage insights (OpenAI Help); role-based access to apps and per-app action controls (OpenAI Help); a Compliance API for conversation and agent activity (OpenAI). |
| Licensing model | A per-user add-on to a qualifying Microsoft 365 plan. Web-grounded Copilot Chat is included with eligible subscriptions at no extra cost (Microsoft Learn). Microsoft publishes list prices; the enterprise add-on was listed at $30.00 per user per month, paid yearly, when we checked on September 26, 2026, and actual pricing varies by agreement (Microsoft). | Bought at the organization level through OpenAI sales. Seat types and billing depend on your agreement, and credit-based agreements add workspace credits for usage beyond included limits (OpenAI Help). OpenAI does not publish an Enterprise list price; its pricing page says to contact sales (checked September 26, 2026, OpenAI). |
Vendor details checked September 26, 2026. Confirm current terms with each vendor.
Start from where your work lives and what you want AI to do, the same way we advise on the four-way comparison.
Start with Microsoft Copilot. The advantage is zero context switching inside Word, Excel, Outlook, and Teams. The challenge is that licenses do not create habits, so plan role-based training from day one.
Copilot training →Choose ChatGPT Enterprise. Custom GPTs built on your templates are the fastest team-level win we build, and Codex covers the engineering side.
ChatGPT training →Fix adoption before you buy more seats. Microsoft includes web-grounded Copilot Chat with eligible Microsoft 365 subscriptions (Microsoft Learn), so teach people to use what they have, then license the roles that prove the value. Our article on unused AI licenses lays out a 90-day plan.
Run both. A common pattern is Copilot for every desk and ChatGPT Enterprise for teams doing heavy writing, analysis, or engineering. Role-by-role training keeps it from turning into tool sprawl.
Role-based training →Clean them up first, whichever platform you pick. Both vendors say their tools surface only what each user can already access, which means oversharing in SharePoint shows up in AI answers too.
Run a short, measured pilot with one or two teams on real work, and baseline their AI literacy first with SINA, our AI literacy platform. Let the usage data decide the rollout.
Readiness assessment →The enablement. In our engagements, the gap between trained and untrained teams is consistently larger than the gap between platforms. Both ChatGPT Enterprise and Microsoft Copilot are capable enough for everyday knowledge work. What usually fails is the bridge between having access and knowing what to do with it on a Tuesday afternoon.
That is why licenses sit idle after a launch email and a demo. We wrote about the pattern, and a 90-day plan to fix it, in We Bought AI Licenses and Nobody Uses Them. The fix looks the same on either platform: baseline with SINA, train each role on its own work, rebuild a handful of workflows, and name champions who keep usage going.
We have done this on both. For Forvis Mazars, CPE-accredited, instructor-led workshops trained 300+ professionals on Microsoft Copilot. For a 150-person data consulting firm, we trained 150+ people on ChatGPT and Copilot and helped establish an AI Center of Excellence.
They answer different questions. Microsoft Copilot puts AI inside Word, Excel, Outlook, and Teams, grounded in the Microsoft 365 data each user can access. ChatGPT Enterprise is a stronger standalone workspace for custom GPTs, agents, and Codex, and it can connect to SharePoint and Outlook. Many Microsoft shops run both and decide role by role.
Yes, through apps. OpenAI documents a SharePoint app that covers SharePoint and OneDrive for work or school, and Outlook email and calendar apps. A ChatGPT workspace admin enables them, and a Microsoft Entra admin grants the Microsoft permissions (OpenAI Help).
Both vendors say no by default. Microsoft says prompts, responses, and Microsoft Graph data are not used to train foundation models (Microsoft Learn). OpenAI says it does not train on business data by default (OpenAI). Have your legal and security teams review the current terms.
Microsoft Copilot is a per-user add-on to a qualifying Microsoft 365 plan, and Microsoft publishes its list prices. ChatGPT Enterprise is bought through OpenAI sales with terms set by your agreement, and OpenAI does not publish an Enterprise list price. For teams of 2 to 200, OpenAI also sells ChatGPT Business with published per-seat pricing (OpenAI).
Yes, and plenty of firms should. A common shape is Copilot for everyone and ChatGPT Enterprise for teams whose work rewards a deeper general-purpose assistant. Role-based training decides who gets what, and SINA shows which platform is earning its licenses.
Whichever one your people are trained to use on their own work. Platform choice matters less than enablement: a baseline, role-based training, a few rebuilt workflows, and champions. Without that, either platform ends up with a small group of enthusiasts and a long tail of idle seats.
Every product claim on this page links to one of these vendor pages. We checked each one on September 26, 2026.
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