Microsoft's 53 New Copilot Features in May 2026

A Multi-Model Copilot: GPT-5.5 and Anthropic Claude

Microsoft has officially moved Copilot beyond a single-model architecture. The May update makes GPT-5.5 Instant available in Copilot Chat and Microsoft 365 Copilot . OpenAI’s GPT-5.5 Instant became the default ChatGPT model on May 5, 2026, and OpenAI claims it produces 52.5% fewer hallucinations compared to the previous default . For tasks requiring deeper reasoning, GPT-5.5 Thinking rolled out to Microsoft 365 Copilot in late April, bringing stronger support for multi-step analysis and complex problem-solving .

Alongside the OpenAI models, Anthropic Claude models are now available as an explicit alternative in both Copilot Studio and Microsoft 365 Copilot . The supported lineup includes Claude Sonnet 4.5, Claude Opus 4.5, and Claude Haiku 4.5, with Microsoft documentation suggesting Claude models can be used for orchestration, chat, and deep reasoning scenarios . However, the implementation comes with important caveats: Anthropic models are enabled by default for commercial customers but are not available in the EU, the UK, or government tenancies . Some Claude models remain tagged as experimental in Copilot Studio, even when that tag isn’t visible to end users .

Excel Gets a Brain: Plan Mode and Python Integration

Two Excel features in the May update represent a fundamental shift in how Copilot handles spreadsheets.

Plan Mode requires Copilot to show a step-by-step plan—including which data ranges, functions, and transformations it intends to use—before applying any changes to a workbook . Users can review the plan, adjust it, and approve execution, which gives spreadsheet authors meaningful oversight over complex multi-step edits . The feature started rolling out in May to Windows, Mac, and web versions of Excel for Microsoft 365 Copilot subscribers .

Python in Copilot for Excel allows Copilot to call Python directly inside the workbook for advanced data analysis, including data transformation, visualization, and multi-step analytical workflows . Users can invoke it explicitly by prompting "Analyze this data using Python" or selecting the "Advanced analysis" card in the Copilot pane. Copilot can also decide to use Python automatically when it determines Python is the best tool for the analysis being requested . The feature opens a new sheet and inserts Python code as refreshable Python cells, so everything is inspectable and editable after the fact .

Autonomous Agents Graduate: Computer-Using Agents in Copilot Studio

Computer-using agents in Copilot Studio reached General Availability on May 7, 2026, an important milestone for Microsoft’s agent strategy . These agents can interact directly with websites and desktop applications through the user interface—clicking, typing, and navigating—to automate multi-step workflows . Organizations can now embed computer-using agents directly into multi-step business processes, essentially giving AI a mouse and keyboard to complete tasks across software that lacks an API integration.

The GA release also brought a redesigned visual workflows experience and Work IQ extensibility to Copilot Studio, helping developers build and manage agent logic more intuitively .

Across the Suite: Notebooks, Mobile, Calendar, and More

The 53-feature wave extends well beyond the headline items. Copilot Notebooks received a refreshed interface with richer context sources—including full Teams meeting transcripts, notes, chat, and shared files—and the ability to generate PowerPoint and Word documents directly from notebook content .

The Calendar Agent allows users to tell Copilot in plain language how to handle certain meetings, and Copilot follows those rules going forward . The Copilot mobile app now sends proactive notifications—such as "Your Day at a Glance" and "Items waiting for you"—grounded in Copilot Memory .

In-app agents can now bring content-rich business apps including Adobe Express, Figma, Optimizely, and Dynamics 365 directly into the Copilot conversation for viewing and editing without switching applications . Copilot has also gained improved visual understanding of embedded images inside Word documents, PowerPoint presentations, and PDFs, allowing it to reason about charts, diagrams, and photos rather than only reading text .

On the presentation side, Clipchamp AI video draft generation was part of the creative suite wave, enabling users to generate rough video cuts from prompts. Teams received call delegation features for routing calls on behalf of a user, as well as consecutive interpretation for real-time language translation in meetings—though detailed technical documentation on these specific Teams features remains limited.

A complete Copilot app redesign launched on May 28, centered on a task-aware prompt surface with progressive disclosure and a unified experience across Word, Excel, PowerPoint, and Outlook . The update also added Power BI integration in Copilot Chat, Outlook email grounding, and native PDF opening .

The Build 2026 Context

Microsoft’s Build 2026 conference takes place June 2–3 in San Francisco, and the May Copilot wave is effectively the prelude. The GA of computer-using agents, the MCP-based federated connector architecture, and the multi-model strategy all point toward a larger narrative that Microsoft is expected to push at Build: Windows as an operating system for autonomous AI agents. The company has already published a "Build agents with Microsoft 365 Copilot" page as part of its May release notes . Work IQ APIs—giving developers access to the intelligence layer behind Copilot through agent-to-agent protocols, MCP, and REST endpoints—point toward a platform expansion that moves Copilot from an assistant into an orchestration layer .