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Introduced in 2012, the GX series was perhaps the first Kubota model range to stand out for its stylishness. The 4-cylinder engines had 3.8 and 6.1 liters of displacement, as in previous models. To meet IIIB requirements, they were now equipped with an oxidation catalyst and a particulate filter. The transmission now had three ranges instead of two, providing 24+24 gears, and with creeper gears, 32+32. The powershift had 8 steps and was equipped with two automatic programs. Lifting power and hydraulic output were increased, and the lifting device was finally electrically operated. For the first time, the M128GX/M135GX could be equipped with front axle suspension. The stated turning circle diameters without steering brakes were very small — this was aided by the standard front wheel speed increase function when turning. The engine, transmission, and hydraulics now communicated with each other via the CAN bus.

In 2014, the designation II was added to the model name with very few changes: the external hydraulic valves now featured flow adjustment, a passenger seat became standard, and front suspension was standard on the M135GX and, in some countries, also the M128GX.

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