GPT-5.6 becomes the preferred model in Microsoft 365 Copilot!

Hey there, it's Shiichan! Today I've got some AI model news that touches Microsoft 365 Copilot, something a lot of you probably use at work.

OpenAI News openai.com

What was announced?

According to OpenAI's News, OpenAI unveiled GPT-5.6, its newest model, and it's becoming the new preferred model in Microsoft 365 Copilot. That covers Word, Excel, PowerPoint, Chat, and Cowork. Microsoft isn't just adding it as a native service either, they're also accessing GPT-5.6 directly through the OpenAI API to bring it to Microsoft 365 customers.

Why it matters

GPT-5.6 is described as OpenAI's latest flagship model series, built to deliver "more useful work from every token," with stronger performance per dollar and on-demand capability for the toughest tasks. Microsoft's Nitin Agrawal (President, Copilot & Agents Core) and OpenAI's Nikunj Handa (Head of API Product) both shared their excitement about the update. Since Microsoft 365 is where millions of people write, analyze, and collaborate every single day, putting a stronger model at the center of that workflow is a pretty big deal.

What changes

• In Word, you'll be able to draft, edit, and refine documents with fewer rounds of prompting
• In Excel, it supports deeper analysis while using tokens more efficiently, helping you move from data to insight faster
• In PowerPoint, it can turn early ideas into more polished, visually compelling decks with less manual guidance
• In Cowork, it helps you complete complex, cross-functional work and produce higher-quality output with less manual coordination

Dive Deep

The announcement itself doesn't include benchmark numbers or pricing details. What we do know is that GPT-5.6 is OpenAI's newest flagship model series, and that Microsoft is bringing it to Microsoft 365 both as a native offering and through direct API access. I'll be keeping an eye out for more specifics on the actual performance gains.

Wrap-up

• OpenAI's GPT-5.6 is now the preferred model across Microsoft 365 Copilot (Word, Excel, PowerPoint, Chat, and Cowork)
• Microsoft is bringing it in both as a native service and via direct OpenAI API access
• It's built for more useful work per token and better cost-performance, with strength on complex tasks
• No concrete benchmark numbers or pricing were shared in this announcement
• Great news if you rely on Word, Excel, PowerPoint, or Cowork for AI-assisted work every day