Microsoft Copilot

license

proprietary(SaaS/embedded)

source

closed

self-host

none

model

OpenAI+Microsoft(closed)

Fully proprietary, delivered as SaaS and embedded in Microsoft products. The closed counterpart to the open chat interfaces in this category.

• https://learn.microsoft.com/en-us/microsoft-365/admin/activity-reports/microsoft-copilot-usage?view=o365-worldwide recorded 2026-08-13

  Microsoft 365 Copilot Chat is a Microsoft-operated proprietary product (admin usage reporting docs)

Business of Apps reports 218 million active users across Windows, the app and the website, plus 88 million downloads since launch - far above the >10M threshold. Actively-engaged Microsoft 365 seats are much lower, around 33M, but the consumer and embedded surface reach is mass-market. The headline traces to Microsoft disclosures relayed through an aggregator rather than a primary per-surface breakdown, so confidence is medium; Microsoft's own admin reporting surface publishes no aggregate count of its own.

• https://www.businessofapps.com/data/microsoft-copilot-statistics/ recorded 2026-08-13

  218 million active users across Windows, the app and the website, plus 88M downloads since launch; the ~420M all-surfaces and ~160M enterprise-licensed figures this record was scored on are no longer on the page (aggregator compiling Microsoft disclosures)

• https://learn.microsoft.com/en-us/microsoft-365/admin/activity-reports/microsoft-365-copilot-usage?view=o365-worldwide recorded 2026-08-13

  Microsoft's own active-usage reporting surface for M365 Copilot (confirms scale of deployed product)

Feature-rich chat UI with class-leading enterprise grounding/integration; not frontier-defining within this category because it is locked to one model provider and not self-hostable. The cited usage doc enumerates Copilot working inside Teams meetings, chat and channels, Word, Excel, Outlook and the rest of Microsoft 365, which is the embedded-grounding breadth the band rests on; it does not name the Graph by that word, so the grounding claim is read from app coverage rather than quoted.

• https://learn.microsoft.com/en-us/microsoft-365/admin/activity-reports/microsoft-365-copilot-usage?view=o365-worldwide recorded 2026-08-13

  M365 Copilot chat features incl. Graph grounding across apps