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Successful implementation of the sterile insect technique (SIT) against <i>Aedes albopictus</i> and <i>Anopheles arabiensis</i> relies on a continuous supply of sterile males. To meet this requirement, optimization of the mass-rearing techniques is needed. This study, therefore, aims to assess a new mass-rearing cage (MRC) in terms of egg production efficiency and egg hatch rate (quality). In addition, adult survival was evaluated based on a cage adult-index for <i>Ae. albopictus</i>. Moreover, the cage’s suitability for use in mass <i>An. arabiensis</i> egg production was compared to that of the FAO/IAEA <i>Anopheles</i> reference cage. In <i>Ae. albopictus</i> rearing, the new MRC produced 1,112,110 eggs per cage following six blood meals, with minimum loss of eggs in the egging water. Furthermore, the adult index gave a good proxy of daily mortality rates in <i>Ae. albopictus</i>. In <i>An. arabiensis</i> rearing, about 130,000 eggs per egg batch were collected both from the new and the reference MRC. These findings suggest that the new MRC prototype is efficient in terms of egg production and can be used for mass-rearing in SIT programs targeting <i>Ae. albopictus</i> as well as <i>An. arabiensis</i>. The adult index was also positively validated for the detection of unusual mortality rates in <i>Ae. albopictus</i> mass-rearing facilities. Overall, the new MRC has shown several advantages; however, further improvements are necessary to minimize escapes during the egg collection processes.