In the Simon task, participants respond to a relevant target dimension while ignoring spatial context information. Target and context information can be congruent or incongruent, resulting in a congruency effect. This effect is typically larger after congruent trials (congruency sequence effect, CSE), presumably because incongruent trials trigger increased focus on the target and inhibition of the distracting context information. In a previous experiment with a number Simon task, we found that specifically performance-contingent (but not non-contingent or no) reward increased the use of context information following congruent trials, while the adaptation to incongruence was the same in all conditions. Drift diffusion model (DDM) analyses revealed that this reward effect was captured by the drift rate parameter. Here, we present a follow-up study using a confound-minimized Simon task, again combined with performance-contingent, non-contingent, or no reward prospect. The CSE was generally increased in the reward phase compared to a non-reward baseline. Furthermore, performance-contingent reward specifically increased the congruency effect, and DDM analyses again found a corresponding effect on the drift rate. Taken together, these results suggest that performance-contingent reward prospect does not induce a simple speed-accuracy trade-off, but rather increases the use of context information, which is beneficial in congruent but detrimental in incongruent trials. Differences between the present and previous results suggest that the CSE is additionally influenced by feature repetitions.