Available today: Anthropic’s Claude Sonnet 5 in Microsoft 365 Copilot Microsoft 365 Copilot Blog articles     •     July 2, 2026, 3:55 pm Starting today, Anthropic's Claude Sonnet 5 is available in Microsoft 365 Copilot—a new frontier model rolling out in Copilot Cowork and PowerPoint, built for agentic, multi-step work across everyday…