Claude lands inside Microsoft Foundry and Excel
Anthropic just expanded its partnership with Microsoft, bringing Claude Sonnet 4.5, Haiku 4.5, and Opus 4.1 to Microsoft Foundry in public preview. Azure enterprise customers can deploy Claude through existing Azure agreements, while Excel's Agent Mode now lets users tap Claude to build spreadsheets and generate formulas. It removes procurement hurdles for teams wanting frontier reasoning inside Microsoft's ecosystem.