  Measurements at $\sqrt{s}$ = 13.6 TeV of the opposite-sign W boson pair
production cross section in proton-proton collisions are presented. The data
used in this study were collected with the CMS detector at the CERN LHC in
2022, and correspond to an integrated luminosity of 34.8 fb$^{-1}$. Events are
selected by requiring one electron and one muon of opposite charge. A maximum
likelihood fit is performed on signal- and background-enriched data categories
defined by the flavour and charge of the leptons, the number of jets, and
number of jets originating from b quarks. An inclusive W$^+$W$^-$ production
cross section of 125.7 $\pm$ 5.6 pb is measured, in agreement with standard
model predictions. Cross sections are also reported in a fiducial region close
to that of the detector acceptance, both inclusively and differentially, as a
function of the jet multiplicity in the event. For first time in proton-proton
collisions, WW events with at least two reconstructed jets are studied and
compared with recent theoretical predictions.
