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Cr3Pt crystallizes in the cubic Pm-3n space group. The structure is three-dimensional. Cr is bonded in a 6-coordinate geometry to two equivalent Cr and four equivalent Pt atoms. Both Cr–Cr bond lengths are 2.34 Å. All Cr–Pt bond lengths are 2.61 Å. Pt is bonded to twelve equivalent Cr atoms to form a mixture of face and edge-sharing PtCr12 cuboctahedra.
Cr3Pt is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Cr sites. In the first Cr site, Cr is bonded in a 12-coordinate geometry to eight Cr and four equivalent Pt atoms. There are a spread of Cr–Cr bond distances ranging from 2.43–2.93 Å. There are two shorter (2.67 Å) and two longer (2.69 Å) Cr–Pt bond lengths. In the second Cr site, Cr is bonded in a 12-coordinate geometry to eight Cr and four equivalent Pt atoms. Both Cr–Cr bond lengths are 2.49 Å. There are two shorter (2.67 Å) and two longer (2.69 Å) Cr–Pt bond lengths. Pt is bonded to twelve Cr atoms to form a mixture of corner and face-sharing PtCr12 cuboctahedra.