Apple plans to pay about US$1 billion a year for an ultrapowerful 1.2 trillion parameter artificial intelligence model developed by Alphabet’s Google that would help run its long-promised overhaul of the Siri voice assistant, according to people with knowledge of the matter. Following an extensive evaluation period, the two companies are now finalising an agreement that would give Apple access to Google’s technology, according to the people, who asked not to be identified because the...