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MC1192003 — Microsoft 365 Copilot: GPT-5 Mode selector adds Auto, Instant, and Thinking modes

MC1192003Microsoft 365 Copilot ChatplanForChangeUpdated: 4 December 2025

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.

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Applies to: Microsoft 365 Copilot Chat
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).