Penelitian ini bertujuan untuk mendeskripsikan kemampuan berpikir kreatif matematis siswa dalam menyelesaikan soal open-ended jenis PISA ditinjau dari level sekolah. Jenis penelitian ini adalah penelitian survei dengan sampel penelitian terdiri dari 10 sekolah SMA di Kabupaten Lampung Timur dengan level sekolah tinggi, sedang, dan rendah berdasarkan akreditasi. Sampel penelitian ditentukan dengan stratified proporsional random sampling. Instrumen yang digunakan berupa tes kemampuan berpikir kreatif jenis soal open-ended PISA yang terdiri atas enam butir soal uraian dan pedoman wawancara. Instrumen tes yang digunakan telah dilakukan validasi isi oleh tiga orang ahli dengan rata-rata hasil validasi berkategori baik. Kami menganalisis data yang terkumpul secara deskriptif berdasarkan indikator dan kategori kemampuan berpikir kreatif matematis. Hasil penelitian menunjukkan bahwa siswa yang dijadikan sampel penelitian memiliki kemampuan berpikir kreatif matematis dengan indikator fluency, flexibility, originality, dan elaboration. Kemampuan berpikir kreatif matematis siswa dalam menyelesaikan soal open-ended jenis PISA mayoritas berada pada kategori cukup baik, baik di sekolah level tinggi, sedang, maupun rendah. Mathematical creative thinking skills in solving open-ended PISA-type problems based on school levelAbstractThis research aimed to describe the ability of students’ mathematical creative thinking in solving open-ended problems of PISA type based on the school level. This is survey research which involved 261 tenth graders from 10 schools with categories of the high, medium, and low school based on their accreditation in the district of Lampung Timur as the sample. We used stratified proportional random sampling to determine the sample. The instruments used in this research consisted of a creative thinking ability test with six constructed response items and interview guidelines. The instrument in the form of a test had been validated by three experts and it was proved to be valid in terms of its content with a good category. We analyzed the collected data descriptively based on the indicators and categories of creative thinking ability. The results show that students who became research samples have creative thinking ability with indicators of fluency, flexibility, originality, and elaboration. The majority of students’ mathematical creative thinking ability in solving open-ended problems of PISA type were in a fairly good category, both in high, medium, and low levels of school.