Luma AI has raised a $900 million Series C round led by HUMAIN, backed by Saudi Arabia’s Public Investment Fund, with strong participation from AMD Ventures, Andreessen Horowitz, Amplify Partners, and Matrix Partners. The deal powers Project Halo, a 2-gigawatt AI compute supercluster in Saudi Arabia, to train 'world models', advanced multimodal AI that learns from video, audio, and language.