Today we’re expanding model choice in Microsoft 365 Copilot with the addition of Anthropic’s latest model—Claude Opus 4.8. Available now in Copilot Cowork (Frontier) and rolling out to Copilot Chat, Excel, PowerPoint, and Copilot Studio. Opus 4.8 builds on Opus 4.7 and previous Opus model strengths. It is designed for complex, multi-step coding tasks and long-horizon agentic work—with improved tool selection, closer adherence to your instructions, and better follow-through across multi-turn w...

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