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A tight positive correlation between the stellar mass and the gas-phasemetallicity of galaxies has been observed at low redshifts. The redshiftevolution of this correlation can strongly constrain theories of galaxyevolution. The advent of JWST allows probing the mass-metallicity relation atredshifts far beyond what was previously accessible. Here we report thediscovery of two emission-line galaxies at redshifts 8.15 and 8.16 in JWSTNIRCam imaging and NIRSpec spectroscopy of targets gravitationally lensed bythe cluster RXJ2129.4$+$0005. We measure their metallicities and stellar massesalong with nine additional galaxies at $7.2 < z_{\rm spec} < 9.5$ to report thefirst quantitative statistical inference of the mass-metallicity relation at$z\approx8$. We measure $\sim 0.9$ dex evolution in the normalization of themass-metallicity relation from $z \approx 8$ to the local Universe; at fixedstellar mass, galaxies are 8 times less metal enriched at $z \approx 8$compared to the present day. Our inferred normalization is in agreement withthe predictions of the FIRE simulations. Our inferred slope of themass-metallicity relation is similar to or slightly shallower than thatpredicted by FIRE or observed at lower redshifts. We compare the $z \approx 8$galaxies to extremely low metallicity analog candidates in the local Universe,finding that they are generally distinct from extreme emission-line galaxies or"green peas" but are similar in strong emission-line ratios and metallicitiesto "blueberry galaxies". Despite this similarity, at fixed stellar mass, the $z\approx 8$ galaxies have systematically lower metallicities compared toblueberry galaxies.

Evolution of the Mass-Metallicity Relation from Redshift $z\approx8$ to the Local Universe