In December 2025, Microsoft announced a significant update to its AI assistant ecosystem with the introduction of Smart Plus mode. This new feature integrates OpenAI’s latest GPT-5.2 series into Microsoft 365 Copilot and Copilot Studio, targeting professional-grade tasks that require advanced reasoning and multi-step logic.
Smart Plus: Advanced Reasoning for Work
The Smart Plus mode utilizes the GPT-5.2 Thinking model, which is designed to solve problems through deliberate, step-by-step reasoning. This model serves as the "thinking engine" for Copilot, prioritizing accuracy and structural quality for high-stakes business tasks.
- Expert-Level Productivity: In the GDPval benchmark—a rigorous evaluation measuring knowledge work across 44 occupations—GPT-5.2 Thinking achieved a win/tie rate of 70.9% against human experts. This marks a major improvement over GPT-5’s 38.8% baseline.
- Coding Performance: The model sets a new standard for software engineering, scoring 55.6% on SWE-bench Pro and 80.0% on SWE-bench Verified. These results indicate a significantly more dependable tool for real-world debugging and code refactoring.
- Long-Context Reasoning: GPT-5.2 Thinking shows strong performance on long-context retrieval tests, successfully locating and integrating information in documents far beyond typical context windows. This includes leading performance on 4-needle evaluations and the MRCRv2 benchmark, which tests accuracy across complex, long-horizon projects.
- Creation of Office Artifacts: The mode excels at generating complex "office artifacts," such as advanced financial models in Excel and structured, data-driven PowerPoint presentations.
Integration with Work IQ and GitHub Copilot
The new model series is deeply integrated into Microsoft’s core productivity and developer tools:
- Work IQ Integration: In Microsoft 365, GPT-5.2 is grounded in Work IQ, enabling it to reason across a user’s "work context"—including emails, meetings, and SharePoint data—to provide actionable business insights.
- GitHub Copilot: GPT-5.2 has begun surfacing in GitHub Copilot as part of Microsoft's broader rollout of GPT-5.x models into its coding assistants, enhancing the "Agent" and "Edit" modes for developers.
- Copilot Studio: Developers can now select GPT-5.2 Thinking in Copilot Studio to build custom agents, benefiting from improved instruction-following and reliable tool-calling.
Availability and Rollout
The rollout of GPT-5.2 and Smart Plus follows a phased deployment schedule:
- Current Access: GPT-5.2 is now available for users with a Microsoft 365 Copilot license and for Copilot Enterprise and Business subscribers.
- Microsoft 365 Premium: Microsoft 365 Premium subscribers are expected to receive access to the new model series in early 2026.
- Global Platforms: The update is currently rolling out across the Copilot web interface, Windows, and mobile applications.
- Free Tier: While the GPT-5.2 series will power the general Copilot experience, access to the high-resource "Thinking" mode will likely be subject to daily limits for non-paid users.
