June 11, 2026. Microsoft has put Anthropic's Claude inside Excel. Through Agent Mode, the AI can now build and edit spreadsheets directly, writing and explaining formulas, cleaning data, generating analysis, and assembling multi-step workflows inside the application that roughly 750 million people use for work. It is the clearest sign yet that AI automation is moving out of separate chat windows and into the everyday tools businesses already pay for.
What changed
- Claude runs inside Excel's Agent Mode. First shown at Microsoft Build 2026, the integration lets Excel users call Claude to write and explain formulas, clean and structure data, generate analysis, and build workflows without leaving the sheet. It is rolling out in preview.
- Opus 4.8 spread across Microsoft 365. Anthropic's Claude Opus 4.8 is now available across Microsoft 365 Copilot, including Researcher, Copilot Chat, the Office apps, Copilot Studio, GitHub Copilot, and Microsoft Foundry, so the same model can work in a document, a spreadsheet, and a custom agent.
- Model choice is now the norm. Microsoft is offering Claude alongside its own and OpenAI's models, which means the question for a business is no longer which assistant to standardize on, but which model to point at each task.
What it means for operators
The practical takeaway is that you do not need to rip out your stack to get value from AI. The spreadsheet your finance team lives in, the documents your operations run on, and the inbox your sales team works can now host automation directly. For a small business, that lowers the barrier sharply: the first AI win can be a cleaned-up reporting workbook or an automated analysis, not a six-month platform migration. The risk is the opposite of last year's. Instead of having no AI, teams will have AI scattered across a dozen tools with no plan. The operators who benefit will be the ones who decide which workflows deserve automation, point the right model at each, and keep a human checking the output that matters.
That is the work we do. Our AI automation builds connect these in-app assistants to the rest of your operation, so the analysis in Excel or the draft in Copilot actually triggers the next step, and if you want engineering help wiring models into your own tools you can hire an AI engineer from us. The lesson of this release is that AI is now model-agnostic and embedded, and the advantage goes to whoever designs the workflow around it.
Frequently Asked Questions
A mode in Microsoft Excel that lets an AI model build and edit spreadsheets directly, writing and explaining formulas, cleaning data, generating analysis, and building workflows. Microsoft now offers Anthropic's Claude as an option inside it, in preview.
Claude Opus 4.8 is available across Microsoft 365 Copilot, including Researcher, Copilot Chat, the Office apps, Copilot Studio, GitHub Copilot, and Microsoft Foundry.
It puts AI automation inside a tool teams already use, so the first project can be a cleaned-up workbook or an automated report rather than a full platform migration. The barrier to a useful AI win drops sharply.
Treat it as a per-task choice rather than a single standard. Different models are stronger at different jobs, and platforms like Microsoft 365 now let you pick. Designing the workflow and checking the output matters more than the brand of model.