Available today: Anthropic Claude Fable 5.1 in Microsoft Copilot Microsoft 365 Copilot Blog articles     •     September 1, 2026, 7:26 pm Claude Fable 5.1 is now joining the frontier models available in Copilot Cowork and Copilot Studio, giving customers more choice as they delegate more complex tasks to AI.  Fable 5.1 is designed for…