Seedance 2.0 Fast is ByteDance's speed-optimized variant of Seedance 2.0. It uses a specialized inference architecture that significantly reduces latency. The model supports 720p and 1080p output with native synchronized audio, 4-15 second durations, and up to 4 reference images for character and style control. Quality tradeoffs against the flagship model are minimal for most workflows, making it well-suited for rapid prototyping, storyboard iteration, A/B creative testing, and high-volume production pipelines where throughput is prioritized.