Today, we’re announcing the general availability of more than 20 purpose-built legal skills and new partner-built plugins, bringing legal-specific capabilities and trusted sources directly into Micro...

A new enforcement layer in Microsoft 365 Copilot that helps defend against indirect prompt injection attacks by isolating untrusted content, constraining how it is processed, and enforcing clear trus...

Copilot Notebooks updates include delegating simple work to Copilot, editing Word, Excel, PowerPoint files directly with the full power of Office, creating interactive reports, and more.

Create, edit, and collaborate with Word, Excel, and PowerPoint directly in the new Copilot app

More models to choose from in Microsoft Copilot with GPT-6.1 Sol and Claude Sonnet 5.5

Welcome to the September 2026 edition of What's New in Microsoft Copilot!

Get more done by bringing trusted plugins into the Copilot experiences used every day.

Change at Scale. Value at Speed

Everyday AI stays at a fixed price per user while advanced AI runs on Copilot Credits.

Claude Opus 5.5 and GPT-6 Sol are joining model choice in Microsoft Copilot.