Hi Siebe,
Until Parinibbana, an Arahant lives like any other human, but without generating abhisankhara. From the time the Arahanthood is attained to the time of Parinibbana, it is called “saupadisesa Nibbana”, where all asavas and avijja are removed, but thoughts are generated.
Thoughts cease only when an Arahant attains Parinibbana or anupadisesa Nibbana. Parinibbana means “Nibbana is complete”.
Some discussion about this at:
Nirödha and Vaya – Two Different Concepts