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Recent TESS-based studies have suggested that the dayside of KELT-1b, astrongly-irradiated brown dwarf, is significantly brighter in visible lightthan what would be expected based on Spitzer observations in infrared. Weobserve eight eclipses of KELT-1b with CHEOPS (CHaracterising ExOPlanetSatellite) to measure its dayside brightness temperature in the bluest passbandobserved so far, and model the CHEOPS photometry jointly with the existingoptical and NIR photometry from TESS, LBT, CFHT, and Spitzer. Our modellingleads to a self-consistent dayside spectrum for KELT-1b covering the CHEOPS,TESS, H , Ks, and Spitzer IRAC 3.6 and 4.5 ${\mu}$m bands, where our TESS, H ,Ks, and Spitzer band estimates largely agree with the previous studies, but wediscover a strong discrepancy between the CHEOPS and TESS bands. The CHEOPSobservations yield a higher photometric precision than the TESS observations,but do not show a significant eclipse signal, while a deep eclipse is detectedin the TESS band. The derived TESS geometric albedo of $0.36^{+0.12}_{-0.13}$is difficult to reconcile with a CHEOPS geometric albedo that is consistentwith zero because the two passbands have considerable overlap. Variability incloud cover caused by the transport of transient nightside clouds to thedayside could provide an explanation for reconciling the TESS and CHEOPSgeometric albedos, but this hypothesis needs to be tested by futureobservations.

CHEOPS finds KELT-1b darker than expected in visible light: Discrepancy between the CHEOPS and TESS eclipse depths