Orion isn't a lander, it's just a crew module. NASA had a competition to design and build a lander and SpaceX won that for Artemis 3 and 4 winning out over Blue Origin and Dynetics designs (there was some drama when they were originally going to select 2 but only selected one and there was a lawsuit).
They're having another competition an additional lander:
https://www.space.com/nasa-artemis-m...an-blue-origin