  The predictions of Standard Model Higgs inflation are in excellent agreement
with the Planck data, without the need for new fields. However, consistency of
the theory requires the presence of (unknown) threshold corrections. These
modify the running of the couplings, and thereby change the shape of the
inflationary potential. This raises the question how sensitive the CMB
parameters are to the UV completion. We show that, due to a precise
cancellation, the inflationary predictions are almost unaffected. This implies
in general that one cannot relate the spectral index and tensor-to-scalar ratio
to the precise top and Higgs mass measurements at the LHC, nor can one probe
effects of UV physics on the running.
