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It's my understanding that the neural engine API wasn't actually exposed to Core ML until the iPhone XS. The GPU is the important factor for performance of those models

Will it be exposed on the iPhone XR (the "mass market" model)?

Presumably it will be supported on the upcoming iPad Pro and iOS' (mOS?) Arm laptop.

No reason to think they wouldn't. It'd be very un-Apple like to bifurcate core APIs like that.

The XR has the same CPU/GPU/NE as the XS, and it's advertised as such from what I recall. It definitely should be there.

The neural engine is a huge boost, but also remember it's a logarithmic scale so the iPhone X is a faster 5x slower than the 6s.

IIRC the neural engine was only available to first party apps in iOS 11.

so on ios 12 iphone x should see some speed up ?