Starting with iOS 18.3, iPadOS 18.3 and macOS 15.3, Apple Intelligence will be enabled by default for supported devices, including iPhone 15 Pro and later, iPads with M1 chips or newer and the latest iPad mini.

Key points:

Automatic Activation: New users or those upgrading will have AI features like notification summaries, Image Playground and text rewriting enabled during setup.

Manual Disable Option: Users can turn off Apple Intelligence via the Apple Intelligence & Siri Settings pane.

Error Warnings: Notification summaries will include disclaimers about potential inaccuracies, following issues reported during beta testing.

To disable Apple Intelligence, users must manually toggle it off in settings after upgrading.

Source: The Verge