Our Gaia DR3 GSP-Spec and literature stellar parameters of solar twins. GSP-Spec parameters were already calibrated following Recio-Blanco et al. (2024). Blue circles, orange triangles, and green squares represent comparisons with Tucci Maia et al. (2016, T16; 37 stars), Nissen et al. (2020, N20; 16 stars), and Shejeelammal et al. (2024, S24; 43 stars), respectively. Typical quoted errors are ~5-10K in T_eff, 0.02 in log g, and 0.005-0.01 dex in [M/H], for both GSP-Spec and literature parameters. Only stars with literature parameters satisfying our solar twin criteria are shown (i.e., stars in gray-shaded areas are excluded). The red open marker indicates the parameters of the Sun. Red thick lines show our adopted relations to convert GSP-Spec parameters to the literature scales. The scatters around the adopted relations are annotated in each panel.