QuantumScape / Honda R&D — QuantumScape signed a multi-year joint research agreement with Honda R&D to co-develop its lithium-metal solid-state battery platform and the associated manufacturing processes — following Honda's completion of a hands-on technology evaluation and benchmarking. A second major automaker (alongside VW's PowerCo) validating QuantumScape's cells, though both sides stress development and manufacturing scale-up, not yet commercial production.
QuantumScape — QuantumScape shipped B-samples of its QSE-5 lithium-metal cell (~844 Wh/L) to automotive customers for qualification — a step from prototype toward a product.
Samsung SDI — Samsung SDI began running a dedicated sulfide solid-state pilot line, shipping sample cells to automakers — the first major maker to move from lab to a pilot production line.
CATL — CATL announced a 'condensed' (semi-solid) cell rated ~500 Wh/kg — the first credible claim to roughly double conventional energy density, initially aimed at aviation.
QuantumScape 
Samsung SDI 
CATL