The new A13 Bionic is still a hexa-core CPU chip, but, thanks to TSMC's latest 7 nm EUV manufacturing process, this SoC now integrates 8.5 billion transistors. It also features a new quad-core GPU plus an octa-core NPU, and all of its components are on average 20% faster and 30% less power-demanding compared to the previous version.
https://www.notebookcheck.net/A-closer-look-at-the-A13-Bionic-SoC-powering-Apple-s-new-iPhone-11-models.434669.0.html