Excel’s New Brain: Agent Mode Brings GPT-5.2 and Claude 4.5 to Desktop

Microsoft has extended its Copilot-powered AI Agent framework from Excel on the web to Excel for Windows and macOS, adding a model selector (e.g., GPT-5.2, Claude Opus 4.5), an Automatic mode for optimal model choice, and features like internet-sourced visualizations, workbook orchestration, formula correction, and ready-made templates (e.g., loan calculator). Access requires a Microsoft 365 subscription, and availability is currently restricted in the EU and UK pending versions with enhanced data sovereignty protections.