GPT‑5.6 is now the preferred model in Microsoft 365 Copilot Today, OpenAI announced GPT‑5.6, which will become the new preferred model in Microsoft 365 Copilot—in Word, Excel, PowerPoint, Chat and Cowork. For Microsoft 365 customers, the update brings OpenAI's latest flagship model series into productivity tools people use every day, helping them create, analyze, and collaborate with more capable ...