 For XCO2 forcing in CMIP-6 simulations shows a muted jet shift during winter compared with CMIP-5 due to a more poleward mean jet position, which is likely caused by increased horizontal grid resolution and reduced bias in jet position relative to re-analysis. These results suggest that CMIP-6 models can provide more realistic projections of SH climate change. This article was authored by Paul Edwin Curtis, Palo Sepi, and Giuseppe Zappa.