There are two Six Frequency Figures, the Great Rhombicuboctahedron and the Great Rhombicosidodecahedron. Each shape is made by cutting the line segments of the Two Frequency Figures into three parts in such a way that when all of the new points are connected all sides are of an equal length. Like the Truncated figures it is better to think of this as cutting off the corners.
In order to make the Great Rhombicuboctahedron a Cuboctahedron's line segments must be cut up in the way described above. Like in the Three Frequency Figures this method doesn't give the exact shape. The shape must squished a little to become a true Great Rhombicuboctahedron.