Apple is rolling out artificial intelligence to all of its computers, launching the latest range of its desktop iMacs that will run on a new generation of processors designed to be fast enough to take advantage of the new capabilities.

The American tech giant is putting its Apple Intelligence features – announced with much fanfare in June – into iPhones, iPads and Mac computers with an update of its operating system. It will overhaul its Siri assistant, giving users new ways to handle incoming emails and write outgoing ones, and new ways to find and manage photos on devices.