In recent years, Apple has been able to fully explore its CPU chip design. The A12 bionic chip continues this trend and is reflected in the performance of the iPhone XS. Although Apple designs these chips itself, the company is not responsible for the production. Since the 2016 A10 chip, TSMC has been the exclusive supplier of Apple chips.
However, there is no detail on how the A13 chip will be upgraded in terms of performance. It will probably be made with the 7nm process. According to reports earlier this week, before the A13 release, we are likely to see another chip, the A12X, produced by TSMC for Apple, which may appear in the upcoming iPad Pro update.