https://wccftech.com/apple-m2-available-in-two-variants/

Prior to its inception, the M2 was rumored to feature a 10-core GPU, with the new custom silicon reported as being marginally faster than its predecessor, the M1. With the new SoC officially here, we get to know that Apple will continue to provide it in two GPU variants, with the base variant sporting an 8-core configuration. While that may be low for some potential buyers, note that it is a significant improvement from the very first Apple Silicon, as we will explain.

With the exception of the new MacBook Pro, the redesigned MacBook Air with the M2 for the least expensive model, features an 8-core GPU. Assuming you are disappointed that Apple has maintained a practice of not revealing the entire picture during the official announcement, there is some silver lining in all of this. For instance, the M1 started out with a 7-core GPU, and customers had to pay a premium to get the 8-core GPU version.