CMB power spectra and cosmological parameters from Planck PR4 with CamSpec

We present angular power spectra and cosmological parameter constraints derived from the Planck PR4 (NPIPE) maps of the cosmic microwave background. NPI PE, released by the Planck Collaboration in 2020, is a new processing pipeline for producing calibrated frequency maps from Planck data. We have created new versions of the CamSpec likelihood using these maps and applied them to constrain the lambda cold dark matter (Lambda CDM) model and single-parameter extensions. We find excellent consistency between NPIPE and the Planck 2018 maps at the parameter level, showing that the Planck cosmology is robust to substantial changes in the mapmaking. The lower noise of NPIPE leads to similar to 10 per cent tighter constraints, and we see both smaller error bars and a shift towards the ACDM values for beyond-Lambda CDM parameters including Omega(K) and A(L).