According to the release notes for the iOS 18.3 release candidate, the final beta for the latest iPhone update before it goes live in (likely to be a few days), Apple Intelligence

While many of us were sleeping, Apple updated iPhones, iPads, and Mac computers with the latest operating system. Included in those updates is Apple Intelligence. Until now, users needed to make a

Disabling Apple Intelligence is the same process whether you're using an iPhone, iPad, or Mac: You don't have to turn off Apple Intelligence completely. You can disable the ChatGPT integration or even turn it off within apps, preventing Siri from making suggestions across all your apps.