Neither Apple's nor Google's announcement says Siri will use Gemini models. Both announcements say, word for word, "Google’s technology provides the most capable foundation for Apple Foundation Models". I don't know what that means, but Apple and Google's marketing teams must have crafted that awkward wording carefully to satisfy some contractual nuance.

Direct quote from Google themselves:

"Apple Intelligence will continue to run on Apple devices and Private Cloud Compute, while maintaining Apple's industry-leading privacy standards."

> "Google’s technology provides the most capable foundation for Apple Foundation Models"

Beyond Siri, Apple Foundation Models are available as API; will Google's technologies thus also be available as API? Will Apple reduce its own investment in building out the Foundation models?

Apple likely wants to post-train a per-trained model, probably along with some of Google's heavily NDA'ed training techniques too.

Check again: https://x.com/NewsFromGoogle/status/2010760810751017017?s=20

"These models will help power future Apple Intelligence features, including a more personalized Siri coming this year."

Mostly likely the wording was crafted by an artificially intelligent entity.