I received a 2017 model with 16GB, 3.6 GHz, Retina 4K display, loaded with the Monterrey 12.0 OS.  I had to update the OS to be current with the12.7.4 version (no problem). Cannot use Apple Pages unless I upgrade to OS 13, Ventura. 16GB should allow for a couple of more OS upgrades. Great performance and great looking except for one 1/2" slight scratch on the screen which doesn't show unless you tilt the screen back and shine a bright light on it. It even came with a generic wireless mouse and keyboard. For the price I would have to say I'm very pleased with this model and feel I made a great purchase.