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The Cosmology Large Angular Scale Surveyor (CLASS) telescope array surveys75% of the sky from the Atacama desert in Chile at frequency bands centerednear 40, 90, 150, and 220 GHz. CLASS measures the largest-angular-scale CMBpolarization with the aim of constraining the tensor-to-scalar ratio, measuringthe optical depth to reionization to near the cosmic variance limit, and more.The CLASS Q-band (40 GHz), W-band (90 GHz), and dichroic high frequency(150/220 GHz) telescopes have been observing since June 2016, May 2018, andSeptember 2019, respectively. On-sky optical characterization of the 40 GHzinstrument has been published. Here, we present preliminary on-sky measurementsof the beams at 90, 150, and 220 GHz, and pointing stability of the 90 and150/220 GHz telescopes. The average 90, 150, and 220 GHz beams measured fromdedicated observations of Jupiter have full width at half maximum (FWHM) of0.615+/-0.019 deg, 0.378+/-0.005 deg, and 0.266+/-0.008 deg, respectively.Telescope pointing variations are within a few percent of the beam FWHM.

Cosmology Large Angular Scale Surveyor (CLASS): Pointing Stability and Beam Measurements at 90, 150, and 220 GHz