Today, artificial intelligence in smartphones is used very actively. Most of the leading single-trusted systems already have specific units for working with AI.
But comparing them with each other is quite difficult. For example, you can use the test AI Benchmark. Furthermore, at the bottom of this software, the result of test devices appeared with two SoCs still unannounced.
As you can see, the SoC Snapdragon 8150 leads, while the second place is taken by SoC MediaTek Helio P80. Interestingly, the third place in Snapdragon 845, which does not have a specific NPU block. Additionally, for the present, the best Qualcomm solution is avoids even the brand new SoC Kirin 980.
However, if you look carefully, the results of the smartphone OnePlus 6 are straightforward two, and in the second figure, Snapdragon 845 is twice lower. And the rest of the devices on this SoC result are far from 12,000 points. So, most likely, there is some kind of wall.
Also note that testing of NPUs is significantly different from testing a CPU or GPU, so there may be other tests where the results will be completely different.