Comparison of the mass-metallicity relations at z = 6 derived from different simulations. Solid blue and red lines show the median values for our evolving IMF and Salpeter IMF models. Black lines show the relations from ASTRAEUS without dust (solid with 1 − σ dispersion; Ucci et al. 2023), ILLUSTRIS-TNG (dot-dot-dashed with 1 − σ dispersion; Torrey et al. 2019), FIRSTLIGHT (dotted; Langan et al. 2020), FIRE (dot-dashed; Ma et al. 2016) and OBELISK (dashed with 1 − σ; Trebitsch et al., in prep.). We have rescaled the metallicities from all these works to our solar value of 8.76.