With the publication of "DSM-5," clinical assessment of Autism Spectrum Disorder (ASD) has begun to follow a new dimensional framework which includes new severity specifiers. Little research has explored these severity ratings in comparison to other previously established severity indicators (e.g. "ADOS-2" calibrated severity score). The current study compared parent and teacher ratings using the "BASC-2" for 43 children and adolescents diagnosed with "DSM-5" ASD, to contribute novel information to the "BASC" literature and to explore the new "DSM-5" severity ratings. Linear regression analyses were conducted to determine the extent to which the "DSM-5" Social Communication and Restrictive/Repetitive Behavior Severity Ratings (clinician-rated) predicted autism severity based on "ADOS-2" calibrated severity scores. Furthermore, linear regressions were conducted to explore whether teacher ratings on the "BASC-2" enhance parent ratings. Implications of these preliminary results for the assessment of children and adolescents with ASD are suggested.