In the title compound, C20H13BF2N4O, the central fused three-ring oxadiazaborininonaphthyridine system is planar (r.m.s. deviation of 0.03 Å). The phenyl ring lies in the plane of this ring system, making a dihedral angle of 0.61 (14)°, and is inclined to the pyridine ring by 9.02 (19)°. In the crystal, molecules are connected by C—H...F hydrogen bonds, forming chains propagating along theb-axis direction. The chains are linked by offset π–π interactions [intercentroid distance = 3.4550 (13) Å], forming a three-dimensional supramolecular architecture.

The title crystal is a co-crystal with the 1,8-naphthyridine derivative crystallizing with one mol­ecule of succinimide per formula unit. In the crystal, the two mol­ecules are mutually linked by N—H⋯O and N—H⋯N hydrogen bonds. The packing is consolidated by C—H⋯(O,N) hydrogen bonds and π–π stacking inter­actions.

The mol­ecule in the title compound, C12H10BBr2F2N3O, exhibits point group symmetry m.