Siri can now search a person's own mail, messages, calendar and photos, understand what is on the screen, and act inside other apps. Apple shipped it in iOS 27, after years of delay.
Not every phone gets all of it. Most of the new features need an iPhone 15 Pro or newer, by Macworld's compatibility list, so an iPhone 14 runs iOS 27 without them. MacRumors reports that Apple's most capable on-device model needs 12 gigabytes of memory, which leaves out the standard iPhone 17 and takes in the iPhone 17 Pro and the iPhone Air.
The model doing the thinking is Google's: a custom Gemini with 1.2 trillion parameters, which Google Cloud's chief executive, Thomas Kurian, confirmed publicly. Apple says requests too large for the phone go to its own servers, with identifying details removed before anything reaches the Gemini model.
Apple spent years promising Siri intelligence of its own, and settled a lawsuit over those promises for $250 million. The model that finally arrived is rented from Google for roughly $1 billion a year.