In the fall of 2020, Valtra's lineup was expanded with the G-series. It replaced the smallest models of the N-series, and compared to those, it was a tractor in a slightly lighter weight class by almost all measures. The engine was a 4.4-liter Agco Power, compliant with Stage 5 emission standards and equipped with urea injection and a particulate filter. Depending on the model, there was an additional 5 to 10 hp available, which could be utilized already at field speeds starting from gear B5. Like other model series, the lineup included a low-speed model, the G125e, where selecting the eco program provided a maximum power at 1750 rpm and maximum torque at 1250 rpm. The transmission in the G-series was the 24+24 speed GIMA-made gearbox, i.e., MF's Dyna-6. There were six powershift gears and the highest road speed was 43 km/h, reached at 1900 rpm. The hydraulics also followed MF’s options: in the Hitech version, there was an open 100 l/min system, while the Active and Versu versions had a closed 110 l/min system. The Versu hydraulics featured 3 electrically controlled valve blocks. Versu equipment also included a SmartTouch armrest with a touchscreen and lever drive control function.

Cab and front axle suspension were available in the Comfort package. The Technology package included automatic steering and Isobus. The cab was fundamentally almost the same as in the A-series.

At the end of 2025, the range was expanded with continuously variable CVT models equipped with Agco ML75 transmissions. The top speed was 43 km/h, and it was achieved at 1500 rpm. The transmission had only one range. The G125e's Eco feature was not controlled with a button like the quick-shift models, but the automatic system took care of optimizing engine control according to the situation and load. The CVT models were available in Active or SmartTouch versions.

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