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Microsoft 365 Copilot app: GPT-5 powers Copilot Chat by default

Copilot
GPT-5 powers Copilot Chat by default
[Android, Windows, iOS, Mac, Web]
Copilot Chat delivers faster, smarter results using GPT-5 as the default model.
Details:
What Changed:
All Copilot Chat experiences run on GPT-5 by default. Copilot automatically routes prompts to the best-performing models for each task, using fast models for basic tasks and specialized reasoning models for multi-step requests.
Why:
Users want speed, accuracy, and minimal friction. This update helps to ensure consistent, high-quality AI interactions in Copilot Chat.
Try This:
“Get me up to speed on the latest plans related to [project/initiative]. Help me think through what to do next.”
“Use the attached spreadsheet with customer feedback to create a polished executive report that helps upper management decide where to prioritize resources in our next cycle.”
Why this matters:
Business Impact:
Increases accuracy and productivity, helping teams make strong decisions and complete complex work faster.
Personal Impact:
Removes friction by letting Copilot choose the best model--fast or reasoning--for the prompt.
Additional resources:
Blogs:
Available today: GPT-5 in Microsoft 365 Copilot
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.
Original source ↗ Crawled: 11 Apr 2026 16:11