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Previous studies have investigated the effects of high ability grouping on students’ academic achievement and self-concept. Due to inconsistent findings, is still not clear whether ability grouping in gifted students is a useful intervention. Some researchers pointed to a more favorable development of academic achievement. Other have warned of costs of high-ability grouping for students’ academic self-concept. We carried out a longitudinal study that investigated the development of high-ability students’ academic achievement, self-concept, and interest in two language domains over the curse of two and a half years. We found that students from special classes were associated with higher decreases of their academic self-concepts, whereas ability grouping was neither related to gains in achievement nor to costs in interest.