GPT-5.6 is now the preferred model in Microsoft 365 Copilot

Source: OpenAI Date: 2026-07-09 URL: https://openai.com/index/gpt-5-6-preferred-model-microsoft-365-copilot

Summary

OpenAI announced GPT-5.6 as the new preferred model across Microsoft 365 Copilot surfaces — Word, Excel, PowerPoint, Chat, and Cowork — pitched on better performance-per-dollar and stronger multi-step task handling. Coverage (TechCrunch and others) frames the post as a public rebuttal to reports of Microsoft building in-house models (MAI) and drifting from OpenAI; the post itself doesn’t address that narrative directly, it just reasserts “preferred model” status.

Implications

• Closed-frontier clock. Confirms GPT-5.6 GA is landing with full distribution muscle behind it — same-week launches across ChatGPT Work and now the largest enterprise-productivity surface available (M365).
• AI adoption in enterprise. “Preferred model” status in Word/Excel/PowerPoint is the highest-leverage enterprise distribution channel any lab has; the fact OpenAI is asserting it publicly (rather than letting Microsoft announce it) suggests the partnership is more contested than the framing lets on.
• Worth a watch-item: if Microsoft’s MAI models start appearing as options alongside GPT-5.6 in Copilot over the next few months, that’s the real tell — this post is the “everything is fine” signal, not proof of it.