check before: 2025-12-04
Product:
Copilot, Copilot Chat, Microsoft 365 Apps, Microsoft 365 Copilot, Teams
Platform:
Online, US Instances, Web, Windows Desktop, World tenant
Status:
Launched
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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summary for non-techies**
Starting December 3, 2025, Microsoft 365 Copilot will introduce three modes—Auto, Quick response, and Think deeper—allowing users to choose between speed and depth in responses, with Auto as the default setting and preferences remembered for future interactions.
Direct effects for Operations**
User Experience with Copilot Modes
The introduction of the mode selector without preparation may lead to confusion among users regarding the new options (Auto, Quick response, Think deeper). Users may not understand the implications of each mode, leading to inconsistent usage and dissatisfaction with the tool's performance.
- roles: End Users, Helpdesk Staff
- references: https://www.microsoft.com/microsoft-365/roadmap?rtc=1%26filters%3D&searchterms=532736
Increased Support Requests
Without prior communication about the new features, helpdesk staff may face an influx of support requests from users who are unsure how to use the new mode selector or who experience unexpected behavior from the Copilot. This could strain IT resources and delay response times for other issues.
- roles: Helpdesk Staff, IT Support
- references: https://www.microsoft.com/microsoft-365/roadmap?rtc=1%26filters%3D&searchterms=532736
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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Last updated 2 days ago ago
