The last tractor series introduced under the Renault name was the 2003 Celtis, which replaced the Cérés. That same autumn, the tractor brand changed to Claas outside of France. The engines were 4.5-liter Deere units, with the two largest being turbocharged. Power outputs ranged from 72 to 97 hp, meaning each model was a few horsepower more powerful than its predecessor. Regarding the transmission, a cheaper technology was offered: the basic transmission was 10+10 without a creeper gear, and as an option, a mechanical or hydraulic creeper gear could be added. A hydraulic shuttle was also available as an option. Alongside the base Profin model, there was a more expensive Comfort model, which came standard with many accessories. Overall, the equipment options were extensive for this size class.

The three smallest Celtis models were also available in rear-wheel-drive versions, with a top speed of 30 km/h. The front axle for the four-wheel-drive versions was manufactured by Carraro. The hydraulic output was 69 liters per minute. Lifting capacity ranged from 2700 to 4600 kg depending on the model. The cab was standardly a low model, but a 14 cm taller comfort cab could be purchased as an extra. There was also a version in the production lineup equipped with a rollover protective structure.

In the 2005 model year, engine power increased by 3 horsepower due to emission updates for all models except the smallest one, and the 80-hp 436 received a turbocharger. The cab noise level dropped to 73 decibels.

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