2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41970We present GUT models based on an $SU(5)\times SU(5)$ GUT group. These models maintain the main successes of simple-group GUTs but permit simple solutions to the doublet-triplet splitting problem. Moreover, GUT breaking is triggered by supersymmetry breaking so that the GUT scale is naturally generated as a combination of the Planck scale and the supersymmetry breaking scale.5 pages, LaTex, Talk presented at SUSY02, 17-23 June, DESY, Hamburg, GermanyHigh Energy Physics - Phenomenologytext