Claude for Microsoft 365 reaches general availability in Word, Excel, and PowerPoint

On May 7, 2026, Anthropic moved the Claude add-ins for Word, Excel, and PowerPoint to general availability and opened a public beta for Outlook. The significance is primarily in how the integration works: Claude maintains context across all four applications within a single ongoing session, so what it knows from a spreadsheet it can apply to a document draft without requiring the user to restate it.

Anthropic describes this as making Claude the first non-Microsoft AI model to ship as a native add-in across the full Office suite. The distinction from browser-based or sidebar AI tools is that Claude reads native document structure—tracked changes in Word, cell references in Excel, slide hierarchy in PowerPoint—and writes back in native format. Output in Word appears as tracked changes. Output in Excel produces editable charts. Output in PowerPoint produces formatted slides.

For enterprise teams that cannot send documents to external servers, the integration can be routed through Amazon Bedrock, Google Cloud Vertex AI, or Microsoft Foundry, keeping data within existing cloud contracts.

For writers who spend a significant portion of their workday in Office applications, this removes the step of copying text into a separate AI interface, rephrasing a request, copying output back, and cleaning up formatting. The workflow stays in the application.

The Outlook beta, which Anthropic opened at the same time, extends the same context-persistence to email—Claude can reference what was in a document when drafting a message about it.