Copilot Cowork: Light-to-Max Reasoning

Key insights

• Copilot Cowork: An agentic mode in Microsoft 365 Copilot that breaks multi-step work into steps, reasons across files and tools, and continues tasks over time with visible progress and checkpoints.
  
• Reasoning Effort: Five levels — Light, Medium (default), High, Extra High, and Max — let you choose faster, shallower answers or slower, deeper analysis depending on the task.
  
• Model selection: You can pick different models for different jobs — e.g., GPT-5.5 Thinking for deep research, Anthropic models for visual and presentation work, and Claude Fable 5 (preview) for long, complex tasks.
  
• Trade-offs: Lower reasoning levels respond faster and use fewer AI credits; higher levels take more time, use more credits, and produce deeper, more thorough results.
  
• Work IQ: Cowork reasons over email, meetings, files, chats, calendars and can use Power BI data for grounded enterprise answers, so it can draft messages, build documents, prepare meetings, and run recurring workflows.
  
• Availability: Cowork is generally available to Microsoft 365 Copilot customers on the web, desktop app, and mobile app; choose model and reasoning level to match speed, cost, and depth for each task.
  

Keywords

Copilot Cowork, Copilot reasoning options, Copilot modes Light to Max, Microsoft Copilot settings, Copilot collaboration features, Copilot behavior tuning, AI assistant reasoning modes, Copilot productivity modes