The title compound, C16H12N2O, exists in the crystalline state as the 5-imino-3,4-diphenyl-1H-pyrrol-2-one tautomer. The dihedral angles between the pyrrole and phenyl rings are 35.3 (2) and 55.3 (2). In the crystal, inversion dimers linked by pairs of N—HN hydrogen bonds generate a graph-set motif of R2 2 (8) via N—HN hydrogen bonds.