Spontaneous thought is a fundamental part of everyday life as it occupies a large part of daily cognition. While it can impair focus during relevant tasks, it also facilitates creative thinking and social processing. Given that atypical spontaneous thought patterns and social processing deficits are common in autism, this study examined how spontaneous thoughts about others, reflecting Theory of Mind (ToM), differ in individuals with autism compared to a comparison group. This variation was studied in social versus rest conditions, where it was hypothesized that social conditions will increase ToM-related thoughts in individuals with autism. Additionally, possible moderation of Discontinuity of Mind and symptom severity were explored. Forty-nine adults (ages 18-30; 24 with autism, 25 comparisons) completed three sessions, including a rest and social condition. Spontaneous thoughts were assessed after every condition using the Amsterdam Resting State Questionnaire (ARSQ). A paired t-test confirmed higher ToM scores in the social condition for participants with autism. Although group differences in ToM scores were significant, a mixed ANOVA showed no significant group x condition interaction. Exploratory linear mixed model analyses found no moderation by DoM or symptom severity. Results suggest that social stimuli enhance spontaneous thinking about others in adults with autism. However, this effect is not specific to autism and there is no clear influence of cognitive control or autism severity. This highlights a nuanced role of social contexts in cognition in autism, offering insights into daily functioning and possible implications for clinical practice.