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Using Gaussian Processes we perform a thorough, non-parametric consistencytest of the $\Lambda$CDM model when confronted with state-of-the-art TT, TE,and EE measurements of the anisotropies in the Cosmic Microwave Background bythe Planck, ACT, and SPT collaborations. Using $\Lambda$CDM's best-fitpredictions to the TTTEEE data from Planck, we find no statisticallysignificant deviations when looking for signatures in the residuals across thedifferent datasets. The results of SPT are in good agreement with the$\Lambda$CDM best-fit predictions to the Planck data, while the results of ACTare only marginally consistent. However, when using the best-fit predictions toCamSpec -- a recent reanalysis of the Planck data -- as the mean function, wefind larger discrepancies between the datasets. Our analysis also reveals aninteresting feature in the polarisation (EE) measurements from the CamSpecanalysis, which could be explained by a slight underestimation of thecovariance matrix. Interestingly, the disagreement between CamSpec andPlanck/ACT is mainly visible in the residuals of the TT spectrum, the latterfavoring a scale-invariant tilt $n_s\simeq1$, which is consistent with previousfindings from parametric analyses. We also report some features in the EEmeasurements captured both by ACT and SPT which are independent of the chosenmean function and could be hinting towards a common physical origin. Forcompleteness, we repeat our analysis using the best-fit spectra to ACT+WMAP asthe mean function. Finally, we test the internal consistency of the Planck dataalone by studying the high and low-$\ell$ ranges separately, finding nodiscrepancy between small and large angular scales.

On the consistency of $\Lambda$CDM with CMB measurements in light of the latest Planck, ACT, and SPT data