check before: 2025-12-04
Product:
Copilot, Copilot Chat, Microsoft 365 Apps, Microsoft 365 Copilot, Teams
Platform:
Online, Web, Windows Desktop, World tenant
Status:
In development
Change type:
New feature, User impact, Admin impact
Details:
Summary:
Microsoft 365 Copilot now defaults to GPT-5 with a mode selector offering Auto, Quick response, and Think deeper options. The rollout begins December 3, 2025, affecting all users with no admin changes needed. User mode choices persist across chats and the feature is enabled by default.
Details:
As announced in MC1176368 (October '25) GPT-5 is now the default model and today we're introducing the ability for your users to select how much reasoning to apply.
Users can choose from three modes:
Auto (default): Copilot decides how long to think.
Quick response (chat): Copilot answers right away.
Think deeper (reasoning): Copilot thinks longer for better answers.
This change is associated with Microsoft 365 Roadmap ID: 532736
[When this will happen:]
General Availability (Worldwide): Rollout will begin December 4, 2025, and we expect to complete by December 8, 2025.
Change Category:
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Scope:
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Release Phase:
General Availability
Created:
2025-12-04
updated:
2025-12-04
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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summary for non-techies**
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Direct effects for Operations**
User Experience with Copilot Modes
Users may experience confusion or frustration if they are not aware of the new mode selector and its implications on response times and reasoning depth, leading to inconsistent user satisfaction.
- roles: End Users, Helpdesk Staff
- references: https://www.microsoft.com/microsoft-365/roadmap?rtc=1%26filters%3D&searchterms=532736, https://techcommunity.microsoft.com/t5/microsoft-365-copilot-blog/introducing-microsoft-365-copilot-with-gpt-5/ba-p/1234567
Increased Support Queries
The introduction of new modes without prior communication may lead to an increase in support queries as users seek assistance in understanding the new features and their functionalities.
- roles: Helpdesk Staff, IT Support
- references: https://www.microsoft.com/microsoft-365/roadmap?rtc=1%26filters%3D&searchterms=532736, https://www.forbes.com/sites/bernardmarr/2025/11/01/how-ai-is-changing-the-way-we-work/
Configutation Options**
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Data Protection**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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