Claude is now available in Microsoft 365 Copilot (www.anthropic.com)

Microsoft announced that Anthropic’s Claude models—Sonnet 4 and Opus 4.1—are now available as selectable options inside Microsoft 365 Copilot, starting with the Researcher agent and Copilot Studio. Enterprise customers who opt into Microsoft’s Frontier Program can pick Claude in Researcher for multistep, high‑depth tasks (reasoning over the web, trusted third‑party sources, and internal content like emails, chats, meetings and files) or use Sonnet 4 / Opus 4.1 in Copilot Studio to build, orchestrate and customize enterprise-grade agents, multiagent systems, workflow automation and prompt tool chains. This integration matters because it brings third‑party model choice and Anthropic’s specialized reasoning capabilities to millions of Copilot users, increasing flexibility for organizations to match model behavior to business needs. Key operational notes: Anthropic models are hosted outside Microsoft‑managed environments and governed by Anthropic’s terms, admins must enable access in the Microsoft 365 admin center, and availability is opt‑in via the Frontier Program. The move underscores competing model ecosystems within major productivity suites—offering potential gains in task accuracy and agent design while raising practical questions on data governance, compliance and model‑specific safety guarantees.