Available today: Anthropic Claude Fable 5 in Microsoft 365 Copilot

We’re expanding model choice in Microsoft 365 Copilot with Anthropic’s latest model, Claude Fable 5 as a preview model—designed to support longer, multi-step workflows. As organizations move beyond simple prompts to more complex work, customers are using Copilot to help plan, draft, and iterate across tasks. With Work IQ, Copilot can ground tasks and outputs in relevant work context—such as files, meetings, chats, and business data—so responses are more relevant to the work at hand. This integration reinforces Microsoft’s commitment to bringing the latest AI innovations to Microsoft 365 Copilot quickly and responsibly—with enterprise protections, administrative controls, and customer choice built in. Admins can manage access to Claude Fable 5 (preview) based on their organization’s policies and readiness. Because use of Claude Fable 5 is subject to data retention by Anthropic, organizations should review this consideration as part of their enablement decision. Learn more Get started today In Microsoft 365 Copilot, pick the right model for the job. Claude Fable 5 (preview) is now available as a default-off option in Copilot Cowork (Frontier), with private preview available today in Copilot in Excel and PowerPoint. Availability may vary by region and tenant configuration; refer to the Microsoft 365 Roadmap and Microsoft 365 Copilot release notes for the latest rollout status. For more details on the model, see Anthropic’s announcement of Claude Fable 5 here .