Microsoft Copilot to Be Powered by Two AIs: OpenAI and Now Anthropic

According to The Information, Microsoft is preparing to announce in the coming weeks the integration of Anthropic’s Claude model into selected Office 365 Copilot features, marking a shift away from sole reliance on OpenAI’s technology stack and signalling that Word, Excel, Outlook and PowerPoint will be powered jointly by OpenAI’s GPT-5 and Anthropic’s Claude.

The move has been interpreted by some observers as a possible sign of fractures in Microsoft’s partnership with OpenAI, though Microsoft stresses that it is not driven by friction but by a strategic aim to select the best models for different use cases. A spokesperson later clarified that the company remains committed to a long-term collaboration with OpenAI and will continue using its frontier models as a foundation.

Sources cited in the report claim that one reason for adopting Claude is Microsoft’s belief that Claude 4 Sonnet outperforms GPT-5 in areas such as producing more aesthetically polished PowerPoint presentations, potentially boosting Copilot satisfaction. Although Claude 4 Sonnet is not Anthropic’s flagship model, Microsoft may also be evaluating Claude Opus or future iterations, all while maintaining the current Copilot pricing of $30 per user per month for Office 365 Copilot.