  The current status of leptonic jet models for gamma-ray blazars is reviewed.
Differences between the quasar and BL-Lac subclasses of blazars may be
understood in terms of the dominance of different radiation mechanisms in the
gamma-ray regime. Spectral variability patterns of different blazar subclasses
appear to be significantly different and require different intrinsic mechanisms
causing gamma-ray flares. As examples, recent results of long-term
multiwavelength monitoring of PKS 0528+134 and Mrk 501 are interpreted in the
framework of leptonic jet models. A simple quasi-analytic toy model for
broadband spectral variability of blazars is presented.
