Benched slopes are commonly used in engineering practice to provide stable and safe access to mining sites, transportation routes, and construction sites. Therefore, their stability under seismic loading is crucial and needs to be considered to improve empirical design. This study investigated single and double-benched slope models constructed with the same lateral confinement area but different shapes. They were tested using a centrifugal shaking table inducing different ground motion intensities. The results indicated that shallow sliding, triggered by the ground motion, started from the crest of the slope and gradually developed towards the lower benches. The stability of slopes with the same cross-sectional area of benches changed based on the bench configuration. Furthermore, the rupture surface of the slope was not exactly a plane surface, but rather a three-dimensional curved surface, indicating that weight, moment and lateral confinement played a crucial role in the seismic deformation behavior of the benched slope. The findings of this study highlight the need for a more accurate and reliable design concept that can optimize the slope geometry and reinforcement techniques to enhance the dynamic stability of benched slopes in various engineering applications.