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Pika opens the weights of H3 Flex, a video model with audio that generates in six steps

Pika H3 Flex is a fine-tune of MiniMax H3 that generates video with synchronized audio in six sampling steps, versus 50 for the original model. The weights (LoRA adapters) are on Hugging Face under the MiniMax H3 community license; locally it generates at 480p and 768p, and Pika's API takes it up to 4K and delivers five separate audio tracks. Pika says it is the best open text-to-video model.