I don't think any is currently using AI generated models yet, at least not for characters/monsters or anything that actually needs to move organically, as that would require manually creating a skeleton and all the animations
One thing to keep in mind is that although the end result looks decent, if you remove the texture and look only at the 3D mesh, the vertices and faces, it looks like a very rough blob. I tried creating a "space soldier miniature" for 3D printing, and let me tell you, the mesh was useless.