  We present a comparative study of the effect of low-temperature opacities on
stellar models up to the Red Giant branch (RGB), computed with the GARching
STellar Evolution Code. We have used two sets of low-temperature opacities;
{\AE}SOPUS ({\AE}) from the University of Padova and those from the Wichita
State University group (F05). In the relevant range of temperatures for this
study, log \k{appa}{\AE} < log \k{appa}F 05. Therefore, to compare stellar
evolutionary tracks, we performed a solar calibration of the {\alpha}mlt, for
each set of low-temperature opacities. After carrying such a calibration, we
find that stellar evolutionary tracks are almost unaffected by the choice of
low-temperature opacities, with largest variations of 25-30 K at the latest
evolutionary stages of the RGB phase.
