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The Arion 500 and 600 series were updated in the summer of 2017. Both the four- and six-cylinder models included one version with lower power than before, and at the top of the lineup was the Arion 660, rated at 205 horsepower for road or forage use, featuring an additional power boost function. The engines were still produced by Deere but were now equipped with urea injection. The six-speed Hexashift transmission with powershift had three versions: Super Eco 40 (1650 rpm), Eco 40 (1950 rpm), and Eco 50 (2000 rpm). The new features included Smart Stop, which allows stopping by simply pressing the brake pedal, and cruise control. An alternative option was Claas's own stepless Cmatic transmission, based on multiple wet clutches. The hydraulics featured a load-sensing 110 l/min pump as standard, with an optional 150 l/min pump available.

There were now three trim levels. The CIS model had mechanical hydraulic valves and the Hexashift transmission. The new CIS+ included a larger color display, an onboard computer, and electrically controlled hydraulic valves. The CIS+ was also available with the stepless transmission, which had an updated drive lever. The Cebis version introduced a new 12" touchscreen. The front axle, manufactured by Dana, was new; the suspended version was structurally simpler than before. The cab was always equipped with coil spring suspension. Four-cylinder models had five cab pillars, while six-cylinder models had four.

The 2020 models featured Stage V-compliant engines. Torque figures increased for some models, and the six-cylinder idle speed was lowered to 650 rpm when the tractor was stationary.

At the beginning of 2025, a 180-horsepower four-cylinder Arion 570 was introduced, available only with the stepless transmission.

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