Video generation startup Luma AI said it raised $900 million in a new funding round led by Humain, an artificial intelligence company owned by Saudi Arabia's Public Investment Fund. The financing, which included participation from Advanced Micro Devices' venture arm and existing investors Andreessen Horowitz, Amplify Partners and Matrix Partners, was announced at the U.S.-Saudi Investment Forum on Wednesday. The company is now valued upwards of $4 billion, CNBC has confirmed. Luma develops