★ Pinned Copilot
23 Dec 2025
copilot
Microsoft 365 Copilot app: GPT-5 powers Copilot Chat by default
Brand Impact
Microsoft has upgraded Copilot Chat to use GPT-5 as its default AI model across all devices and platforms, making it faster and more capable at understanding complex requests. This means Copilot will now deliver more accurate recommendations and insights when users ask it to analyze data, summarize information, or help with business decisions. Brands and products that integrate with Microsoft 365 could see increased visibility if they're frequently referenced in workplace documents, spreadsheets, and communications that users ask Copilot to analyze or summarize.