Although Google's TensorG3 appears on expensive flagship phones, it will ultimately disappoint because the chipset's measured performance is still surpassed by the three-year-old A14 Bionic chipset. However, the company still has its own grand plan to develop processor chips. It is reported that the TensorG5 launched in a few years will bring both customized CPU and GPU.
Developing a custom chipset is not a simple matter, and many phone manufacturers have tried and failed. We have learned that TensorG4 is not expected to have any major upgrades over TensorG3, but according to @OreXda, it is possible that the CPU is designed by Samsung or Google. In the case of TensorG5, both the CPU and GPU are likely to be developed by the advertising giant, which would put it in the same camp as Apple, but we can't comment on its performance or efficiency.
However, there have been previous reports that Google may turn to TSMC to mass-produce TensorG5, possibly because the Taiwanese giant has better technology than rival Samsung. Unfortunately, switching foundries will increase the manufacturing cost of TensorG5, forcing Google to cut profits or pass the cost increase on to customers. However, if Samsung can prove that its next-generation manufacturing process is on par with TSMC, Google may stick with the original foundry.
TensorG5 will be available as early as 2025, so the intricate details about its CPU and GPU are not yet known. This rumored release schedule means that, assuming Google sticks with these two flagships, a fully custom chipset will launch with the Pixel 10 and Pixel 10 Pro. We don't know the exact CPU architecture details yet, nor do we know how many roadblocks Google may encounter at any point in the development phase.