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Microsoft Copilot Blog
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Available today: OpenAI’s GPT-5.6 in Microsoft 365 Copilot

Xia_Song's avatar
Xia_Song
Icon for Microsoft rankMicrosoft
Jul 09, 2026
Starting today, OpenAI's GPT-5.6 family of models is available in Microsoft 365 Copilot—in Word, Excel, PowerPoint, Chat and Cowork. OpenAI and Microsoft partnered together to optimize GPT-5.6 for kn...
Updated Jul 10, 2026
Version 5.0
cowork
Max_vA's avatar
Max_vA
Brass Contributor
Jul 12, 2026

What model exactly is used in Copilot Chat when selecting "GPT 5.6 Think Deeper"? GPT 5.6 has three different Models: Luna, Terra, Sol. It would also be great to know what thinking effort is associated with that setting: Low - Medium - High - Max? If asked in Copilot, the GPT 5.6 model returns the knowledge cutoff being August '25, which is the cutoff for GPT 5.2. Shouldn't it return February '26, which is the cutoff for 5.6?