How do I make a octahedron in Blender 2.8= I have been searching a lot on how to make an octahedron, but everything doesn't seem to work in the newest update, so I'm just asking if there's been some new way added to make them.
Or you can just bevel the default cube.


Select all vertices
Bevel the cube (check Clamp overlap)
Remove double vertices Mesh > Clean up > Merge by Distance