This paper presents the results of a study exploring the intercultural development of first-year Japanese university students engaged in online intercultural exchange (OIE) using two variations: one implementing guided reflection, and the other relying on the learner autonomy model. Intercultural development was quantitatively measured using the Intercultural Sensitivity Scale (Chen & Starosta, 2000) and qualitatively investigated through participants’ written reflections. Results of the OIE using guided reflection showed significant gains in respect for the target culture, whereas the OIE that followed the autonomous learning model yielded significant gains in self-efficacy in relation to intercultural contact. Qualitative analysis of student reflections confirmed these findings and provided insight into the processes involved in achieving these results.