Microsoft reportedly plans to start using Anthropic models to power some of Office 365’s Copilot features

Microsoft reportedly plans to begin using Anthropic’s latest Claude models to power some of the Copilot features in its Office 365 apps. In a report , The Information said the tech giant would announce the change “in the coming weeks.” Microsoft currently relies on OpenAI’s tech to power the majority of AI features found inside of Word, Excel, Outlook and PowerPoint.

As an outsider looking in, Microsoft’s embrace of Anthropic’s models would appear to signal a deepening split between the company and OpenAI. Microsoft is the AI lab’s , and was integral to Sam Altman’s rehiring as CEO following his . However, in recent months reports of a between the two in negotiations over OpenAI’s plan to as a have bubbled up.

For its part, Microsoft denied the move is motivated by animosity. “As we’ve said, OpenAI will continue to be our partner on frontier models and we remain committed to our long-term partnership,” a company spokesperson told The Information.

Still, the decision likely comes as unwelcome news for OpenAI. The Information reports Microsoft is at least partly motivated by the fact it believes “performs better in subtle but important ways” than . For example, The Information’s source said Anthropic’s model tends to generate “more aesthetically pleasing” PowerPoint presentations. Notably, that’s coming from an older model, and one that isn’t even Anthropic’s flagship offering.

Anthropic did not immediately respond to Engadget’s comment request. According to The Information, Microsoft does not plan to charge more for access to Anthropic models in Office 365, with Copilot pricing set to remain at $30 per user per month. That’s notable because the company will pay Amazon to access Claude Sonnet 4 , Anthropic’s primary cloud provider. As part of its investment in OpenAI, Microsoft can access the company’s models at no additional cost.