ChatGPT
OpenAI
4.5
The general-purpose assistant that defined the category and still sets its default expectations
Chat AssistantsFreemium
Microsoft Copilot
The assistant embedded across Microsoft 365, Windows and Edge for enterprise workflows
3.5
by MicrosoftUpdated Overview
Microsoft Copilot brings AI assistance into Word, Excel, Outlook, Teams and Windows, grounded in an organization's own Microsoft Graph data. It is sold primarily as an enterprise productivity layer rather than a standalone chatbot.
Key capabilities
- Microsoft Graph grounding
- Word and Excel assistance
- Teams meeting recap
- Outlook drafting
- Copilot Studio agents
- Windows integration
Strengths
- Grounding in Microsoft Graph gives answers that reference your own mail, files and meetings
- Teams meeting summaries and action-item extraction deliver value with almost no user training
- Copilot Studio lets non-developers build scoped internal agents on existing permissions
- Enterprise data handling and admin controls satisfy most procurement and compliance reviews
Limitations
- Quality varies sharply by app — Excel assistance lags Word and Teams noticeably
- Value depends on tenant hygiene; poor permissions and stale SharePoint data surface bad answers
- Per-seat licensing on top of existing Microsoft 365 costs makes broad rollouts expensive
- The consumer Copilot and the Microsoft 365 product share a name but not a capability set
Copilot is best understood as a distribution strategy rather than a model. The underlying assistance is competitive but rarely leading; the reason organizations buy it is that the work already lives in Outlook, Teams and SharePoint, and Copilot reads that data under existing permissions.
That grounding is also the main implementation risk. Copilot inherits whatever access model your tenant already has, so over-shared SharePoint sites and unmanaged permissions become discoverable in a way they were not when nobody was searching. Several enterprise rollouts have stalled on exactly this, and permission remediation should be scoped before the pilot, not after.
Adoption results have been mixed in practice. Meeting recap and mail drafting see consistent use; spreadsheet and analysis features see far less. Pilot with a narrow set of licenses and measure real usage before committing seats organization-wide.
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