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OpenAI says GPT 5.6 is the ‘preferred model’ for Microsoft Copilot 365 amid breakup chatter
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OpenAI has announced that its GPT 5.6 model will become the "preferred model" for Microsoft 365 Copilot, a move aimed at calming speculation of a rift between the two companies. The announcement came during GPT 5.6's launch on Thursday, directly addressing reports that Microsoft was increasingly relying on its own AI models. This development highlights the delicate balance in one of the tech industry's most important partnerships.
Earlier this week, Bloomberg reported that Microsoft had been replacing some OpenAI software with its in-house MAI models in Word, Excel, and other apps to cut costs. That story fueled questions about whether the alliance between Microsoft and OpenAI was weakening, as both companies had sent mixed signals about their relationship. The new announcement appears to be a direct response to those concerns.
During the launch, OpenAI stated in a blog post that GPT 5.6 would support Microsoft users across productivity apps including Word, Excel, PowerPoint, and Cowork. The company wrote: "Our partnership with Microsoft has always been about bringing the benefits of advanced AI to more individuals and organizations, and we’re excited to continue building on that shared commitment." This statement reinforces OpenAI's desire to maintain a close collaboration.
However, what "preferred model" means exactly is unclear. The designation does not contradict Bloomberg's earlier reporting, which never claimed that OpenAI's software would be entirely removed, only that Microsoft was turning to its own models to reduce expenses. Thus, the announcement may be more of a symbolic gesture than a substantive change.
Market reactions have been mixed, with some analysts viewing the announcement as a necessary reaffirmation of the partnership. Others note that Microsoft's cost-cutting pressures remain, and the development of MAI models suggests a strategic diversification. OpenAI's statement emphasizes commitment, but the underlying dynamics of the relationship are shifting.
Looking forward, the partnership is likely to evolve into a more complex arrangement. While GPT 5.6 will power Copilot, Microsoft may continue deploying its own models for efficiency. This dual approach could become a model for future AI collaborations, balancing innovation with autonomy. The tech industry will be monitoring closely to see how this balance is maintained.
