GPT-4.1 is now the default generative engine for Copilot Studio orchestration. It provides significantly faster function-calling and deeper reasoning for dynamic tool selection.
Additionally, Claude Sonnet 4.5 is now fully supported as an optional model specifically optimized for Computer-Using Agents (CUAs), given its superior visual reasoning capabilities.
The most requested feature of 2025 is now GA: HITL Dynamic Workflow Nodes. When an agent reaches a high-stakes decision point, it can automatically pause execution and trigger a structured Outlook Adaptive Card Form.
The human manager reviews the agent's proposed action in Outlook, modifies the parameters if necessary, and clicks 'Approve'. The agent instantly wakes up and resumes the workflow with the human's input.