Flapping Airplanes raised a $1 billion Series A at a reported $6 billion valuation co-led by Index and Lux, a follow-on round just nine months after its $180 million seed round at a $1.5 billion valuation — a 4x valuation increase. Returning investors Sequoia, GV and Kleiner Perkins participated alongside Valor, Atreides, A* and Nvidia. The year-old lab founded by Aidan Smith and brothers Asher and Ben Spector is focused on training large models with less data — "without ingesting half the internet" — with no client, revenue, pipeline or employee count metrics disclosed and no specific use of proceeds detailed beyond that mission.