Mozilla: open-weight models trail US frontier by ~4.4 months
Mozilla’s State of Open Source AI v1.1 (Sept 15) pegs the open–closed gap at about 4.4 months on METR task horizons. Top open models are far cheaper—e.g. Kimi K3 ~2 points behind Claude Fable 5 at roughly 30% the price—so Mozilla advises open as the default for most work.
