This article carries out a comparison of frontline stakeholder perspectives in order to determine whether CLIL can accommodate diversity in linguistic and intercultural teaching. It reports on a cross-sectional concurrent triangulation mixed methods study with 2,676 teachers, students, and parents in 36 Primary and Secondary schools across Spain. It employs four types of triangulation and carries out across-cohort comparisons in order to determine the potential of CLIL to provide diversity-sensitive teaching. This study positively disrupts some previous trends and evinces that, as mainstream bilingual programs become ingrained in our education systems, measures to cater for diversity are also increasingly apparent.