Apple A12 & A12X *** Now A12Z as well *** Now in a Mac mini

7 nm, presumably TSMC
6.9 billion transistors
512 GB addressable storage
6-core with 2 big and 4 LITTLE cores (No, Apple didn’t use the big.LITTLE terminology)
big cores are 15% faster and 40% more efficient
LITTLE cores are 50% more efficient
All 6 cores can be used simultaneously
5 trillion OPs per second for new Neural Engine (Old one did 0.6 trillion.)
4-core GPU

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A12X Bionic

7 nm
>10 billion transistors
1 TB addressable storage
8-core with 4 big and 4 LITTLE cores (No, Apple didn’t use the big.LITTLE terminology)
All 8-cores can be used simultaneously
5 trillion OPs per second for new Neural Engine
Single-core 35% faster than old iPad Pros (A10X)
Multi-core 90% faster than old iPad Pros (A10X)
7-core GPU
A12X GPU 2X previous GPU, and 1000X original iPad
Xbox One S class GPU in a 94% smaller volume.

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It’s March 18, 2020, and today Apple has just introduced the Apple A12Z Bionic.

Pro Performance with A12Z Bionic Chip

Built for the most demanding tasks, like editing 4K video or designing 3D models, iPad Pro gets another performance boost with the new A12Z Bionic chip. The eight-core GPU in the A12Z Bionic, along with an enhanced thermal architecture and tuned performance controllers, gives iPad Pro the highest performance ever in an iPad. Combined with the eight-core CPU and the powerful Neural Engine, which enables next-generation apps, there’s no other chip that can offer the incredible performance found in the thin and light design of iPad Pro.

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2020-06-22: This is it guys! Apple finally has announced Mac on ARM, and they’re using A12Z for the dev kits.