MC1192003

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

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:

  • 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.

Users will see a new selector in Copilot experiences.

[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.