Which ios devices support​ offline speech recognition Which ios devices allow a user to do speech recognition (the microphone in the keyboard to type) when there is no internet connection (or a slow connection).

My brand new iPad mini cannot do it but some other devices can.

Is there a list or some other way to know?
It may be only those devices with the A9 processor.  If so, that would be iPhone 6s, 6s+, and iPad 7th Generation. 

It seems logical that the A10 (iPhone 7, 7+) would also do it, but I don't know.