Microsoft: Copilot Cowork is now available in Frontier

Microsoft Copilot Cowork became available to early adopters through Microsoft’s Frontier program on March 30, 2026. It is built on Anthropic’s Claude and operates differently from the single-prompt Copilot interactions already embedded in Microsoft 365 applications.

Where standard Copilot responds to a prompt and stops, Cowork handles multi-step, long-running tasks by letting users describe an outcome and delegating execution across Word, Outlook, Teams, and Excel with context maintained between steps. A user can hand off a task like “draft a summary of this thread, send it for review, and schedule a follow-up” without rebuilding context at each step.

The feature that stands out for editorial workflows is Critique mode: GPT generates an initial draft, then Claude reviews it for accuracy and flags potential errors before the writer sees the output. For anyone producing content inside Microsoft 365, this is a structural change in how the two AI systems interact — one optimized for fluency, the other for factual reliability, in sequence.

Cowork is currently in Frontier, Microsoft’s early access program, and is not yet available to all Microsoft 365 subscribers.