First results of the CMS experiment at 13.6 TeV

The CMS experiment recorded about $38.5\,\mathrm{fb}^{-1}$ of proton-proton collision data at $\sqrt{s}=13.6\,\mathrm{TeV}$ in 2022, the first year of the LHC Run 3. Performance highlights on electron triggers, tracking with muons, and jet energy calibration are shown. The CMS luminosity measurement and an independent cross-check based on the counting of Z boson events are discussed. Finally, the first Run 3 cross section measurement of top quark pair production is presented.