OpenAI names GPT 5.6 preferred model for Microsoft 365 Copilot
SkimNews Take
OpenAI using a product stage to publicly designate its model as "preferred" in a partnership converts a capability announcement into a relationship reassurance — a move that itself signals the partnership's stability was newsworthy enough to rebut.
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- OpenAI announced during its GPT 5.6 launch on Thursday that the model is now the 'preferred model' powering Microsoft 365 Copilot.
- GPT 5.6 will support Microsoft users across Word, Excel, PowerPoint, and Cowork, per an OpenAI blog post.
- Microsoft was reported by Bloomberg earlier this week to be replacing some OpenAI software with its own in-house 'MAI' models in Word and Excel to cut costs.
- OpenAI wrote in its blog: '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.'
- The 'preferred model' designation is undefined, and the disclosure does not negate Bloomberg's prior reporting that Microsoft is increasingly relying on its own models.
Why it matters: Microsoft's reported cost-cutting pivot to in-house 'MAI' models suggested growing independence from OpenAI, but the 'preferred model' label signals OpenAI remains embedded in Microsoft's flagship productivity suite. The ambiguity of what 'preferred' actually means lets both companies claim the partnership is intact while Microsoft continues quietly building its own AI stack.
