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◉ Claude.ai/2026-03-14Beginner

Claude Sonnet Comes to Microsoft 365 Copilot

Anthropic's Claude Sonnet models are now integrated into Microsoft 365 Copilot, enabling Claude in Word, Excel, Teams, and other M365 apps for enterprise users.

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Claude Arrives in Microsoft 365 Copilot

On March 9, 2026, Microsoft announced the integration of Anthropic's Claude Sonnet models into Microsoft 365 Copilot. Previously, M365 Copilot relied exclusively on OpenAI's GPT models — but now, the latest Claude Sonnet 4.6 and other Claude models are available across the Microsoft 365 app suite.

For enterprise users already working within Word, Excel, PowerPoint, Teams, and Outlook, this means Claude's advanced reasoning and generation capabilities are now available right inside the tools they use every day.

What Changes? Key Benefits

Freedom to Choose Your AI Model

M365 Copilot users can now select the AI model best suited to their task. Claude Sonnet particularly excels at:

  • Reading and summarizing long documents (heavy Word and PDF processing)
  • Complex data analysis and explanation (Excel spreadsheet interpretation)
  • Code generation and review (developer workflows)
  • Maintaining context across long conversations (extended assistant sessions)

Using Claude in Copilot Chat

Initially, users can select Claude Sonnet as the model in Copilot Chat (formerly Microsoft 365 Chat). The rollout is expected to complete by late March 2026. Note that EU/EFTA, UK, government, and sovereign cloud environments are not included in the initial rollout.

Pricing

Claude usage is included within the existing M365 Copilot subscription at $30/user/month up to a certain volume, with additional usage available for purchase.

What Is Copilot Cowork?

One of the most notable announcements alongside this integration is Microsoft Copilot Cowork — a Microsoft-built implementation inspired by Anthropic's Claude Cowork desktop agent. It can autonomously handle complex tasks such as:

  • Creating applications
  • Building spreadsheets
  • Organizing and analyzing large volumes of data

Copilot Cowork is positioned as a cornerstone of Microsoft's AI agent strategy, bringing Claude's autonomous computer-use capabilities to enterprise-grade deployments.

Why Claude and M365 Are a Strong Fit

Claude Sonnet 4.6 was designed to deliver frontier performance in coding, agentic tasks, and professional work at scale — making it a natural fit for Microsoft's business environment. Here's why:

CapabilityClaude's Strength
Long-form processingUp to 200K token context window
Precise instruction followingFaithful responses to complex prompts
SafetyConstitutional AI from Anthropic
Agentic capabilityMulti-step autonomous task execution

What Comes Next

Microsoft has announced plans to expand Claude's integration into Copilot Studio — the enterprise tool for building custom AI agents — allowing organizations to build Claude-powered agents tailored to their own business workflows.

Claude models are also becoming available through Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry, supporting enterprise multi-cloud strategies.

Key Takeaways

  • Claude Sonnet integrated into M365 Copilot (announced March 9, 2026)
  • Available in Word, Excel, Teams, and more
  • Copilot Cowork brings Claude's autonomous agent capabilities to enterprise users
  • Included in the existing M365 Copilot subscription ($30/user/month) with volume limits
  • Full rollout expected by late March 2026

The deepening partnership between Microsoft and Anthropic marks a significant milestone in AI's integration into everyday business workflows. With Claude's capabilities available directly inside familiar Office apps, enterprise productivity is poised for a meaningful transformation.

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