MC1192003 Plan for changeNew featureUser impactAdmin impact

Microsoft 365 Copilot: GPT-5 Mode selector adds Auto, Instant, and Thinking modes

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.

Roadmap: 532736

Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".

What the notice says

Microsoft’s text, safely structured

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.

How this affects your organization

Who is affected: All users of Microsoft 365 Copilot.

What will happen

Users will see a new selector in Copilot experiences. Notice image
Default mode is Auto; users can switch to Quick response or Think deeper.
User's choice is remembered and retained for new chats.
No admin configuration changes required. There are no admin controls for this feature.
Feature is enabled by default for all tenants.

What you can do to prepare

No action required; this is a standard rollout.
Optional: Communicate the new modes to helpdesk staff and users.

Compliance considerations

No compliance impacts identified. Review your organization’s policies as needed.

What changed

Between archive captures, newest first

The archive supplies one version of this notice.

Learn more

Links from the notice and their documentation checks

Not confirmed here

What this page cannot tell you

Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.