OpenAI’s latest AI model, GPT 5.6, will now serve as the “preferred model” for Microsoft Copilot, the company announced Thursday. The move comes amid speculation about a growing rift between the two long-time partners.
What GPT 5.6 means for Microsoft 365 users
GPT 5.6 will power Microsoft’s suite of productivity tools, including Word, Excel, PowerPoint, and Cowork. OpenAI framed the update as a continuation of its partnership with Microsoft, emphasizing a shared goal: bringing advanced AI to more users and businesses.
Earlier this week, reports suggested Microsoft was quietly replacing some of OpenAI’s models with its own in-house AI, codenamed MAI, to cut costs. While the shift didn’t signal a full breakup, it raised questions about the future of their collaboration.
Why “preferred model” matters
OpenAI’s announcement doesn’t clarify what “preferred model” entails beyond confirming GPT 5.6 will remain a key driver for Copilot. Importantly, previous reports never indicated OpenAI’s software would stop powering Microsoft’s apps—just that Microsoft was diversifying its AI sources.
The update leaves room for both companies to keep working together while pursuing their own AI advancements. For now, users can expect GPT 5.6 to play a central role in their Microsoft 365 experience.
