https://techcrunch.com/2018/11/14/macbook-pro-with-updated-gpu-is-now-available/

Apple recently unveiled a bunch of new products during a press event in New York. But the company also quietly shared a press release with new configurations for the 15-inch MacBook Pro. Customers can now get a MacBook Pro with an AMD Radeon Pro Vega 16 or Vega 20 graphics processing unit.

Before this update, users could only get Radeon Pro 555X or 560X GPUs. Those options are still available, but you can now pay a bit more money to get much better GPUs.