Within the light of the DSM-5, the current study examined (1) how many and which children with a DSM-IV classification of autism spectrum disorder (ASD) fulfill the DSM-5 symptom-criteria, and (2) whether children who did and did not meet DSM-5 symptom-criteria and children with social anxiety disorder (SAD) can be differentiated from each other based on ASD symptomatology. In total, 90 referred children with a DSM-IV classification of high-functioning ASD, and 21 referred children with SAD participated (age range 7–17 years). ASD-symptoms were examined with the Autism Diagnostic Interview-Revised and the Children’s Social Behavior Questionnaire. It was found that 30 % of the ASD sample did not meet DSM-5 symptom-criteria for ASD, mainly because they failed to meet the DSM-5 criteria of the repetitive domain. Children with ASD who did and did not meet DSM-5 symptom-criteria differed on the repetitive domain, while children with ASD (according to DSM-IV and DSM-5 symptom criteria) had higher scores on the social-communication domain than children with SAD. Findings suggest a continuum of ASD-symptoms in the DSM-5 for children with SAD, social communication disorder and ASD. More research is needed to examine how these three disorders differ with respect to their etiology, neuropsychological profiles and clinical characteristics.