Top panel: Optical colors of SN 2023gpw interpolated using a GP fit (shaded regions denote the 1σ uncertainty of this fit). The g − r color seems to become bluer during the rise to the peak, but the uncertainties of the measured colors are also consistent with no evolution in g − r until around the peak. Bottom panel: Comparison of the g − r color of SN 2023gpw with other SLSNe II (Miller et al. 2009; Inserra et al. 2018; Kangas et al. 2022), all corrected for Galactic extinction. The colors of comparison SNe have been GP-interpolated for visual clarity.