G4M3

- G4M3 Model 34: Redesigned G4M2 with added self-sealing fuel tanks, improved armor protection and an entirely new tail gunner's compartment which was quite similar to that of late model American B-26 Marauders. Wings were also redesigned and horizontal tail plane was given dihedral. Armed with two Type 92 7.7 mm machine guns in nose cabin and in both side positions, and one type 99 model 1 20 mm cannon in dorsal turret and tail. Entered production in October 1944 in G4M3a Model 34 Ko form with 20 mm cannon in side positions instead of machine guns. 

- G4M3a Model 34 Otsu and Hei: Similar modifications as in corresponding Model 24 variants. 

- G4M3 Model 36: Prototype. Two G4M2 Model 34 modified to Mitsubishi MK4-T Kasei 25b Ru 1,825 hp (1,360 kW) engines. 

G6M1

- G6M1 Japanese Navy Long Range Heavy Fighter Type 1: Initial model of the series, armed with Type 99 20 mm cannons between each side of fuselage and in tail, one 7.7 mm machine gun in nose cabin and one 30 mm cannon in front ventral position. Thirty built. 

- G6M1-K Trainer, Japanese Navy Type 1: Converted G6M1s. 

- G6M1-L2 Transport Type 1, Japanese Navy: Modified as transports.