Borderline (BPD) and schizotypal personality disorder (SPD) were introduced in the Diagnostic and Statistical Manual of Mental Disorders, Third Edition (DSM–III). However, the clinical differentiation of the 2 diagnoses (e.g., psychotic-like features) was challenging for diagnostic classification and clinical management. With the introduction of the alternative model for personality disorders (AMPD) in DSM–5 Section III, a dimensional approach was proposed, which potentially holds promise for better future differentiation between BPD and SPD. The present study sought to examine the psychopathology using the AMPD model. A total of 105 patients were interviewed, 25 were excluded according to exclusion criteria, and the final sample comprised 80 patients who fulfilled the DSM–5 criteria for BPD (n = 35), SPD (n = 25), and comorbid BPD þ SPD (n = 20), respectively. All patients were administered The Structured Clinical Interview for DSM–5 alternative model for personality disorders Modules I and II. One-way analysis of variance tests with planned contrasts were used. Results showed that for AMPD Criterion A, the BPD þ SPD group had the most severe impairment of personality functioning, except for Identity, where the SPD group showed the most severe impairment. For AMPD Criterion B, the domain of Detachment and the facet of Eccentricity from the Psychoticism domain were most prominent for the SPD group relative to the 2 other groups. The differentiating between BPD and SPD manifestations of cognitive/perceptual disturbances does not seem resolved by the Psychoticism domain, which covers broader aspects of psychopathology. Future research should further investigate the construct of Psychoticism, especially to differentiate nonpsychotic symptoms (e.g., dissociation) and address thought disorder.