NVIDIA Research · 4K Video Refiner

SoL-Refiner

From NVIDIA's SANA team (SANA-Video 2.0 was covered in week 30): a refiner that takes low-resolution output from any base video generator and lifts it to 4K in a single denoising step at the target resolution. It is trained with high-resolution continual training, frame-based RL post-training and one-step distribution-matching distillation, and supports bidirectional and streaming inference. NVIDIA reports cutting MiniMax H3 4K generation from 152.3 seconds to 5.64 seconds (27x), plus 1.60x on SANA-Video, 2.81x on Cosmos-Nano and 3.46x on Wan, on 24fps clips of 81 to 189 frames on H100 and GB200, all vendor-reported. Code in the NVlabs/Sana repo; paper arXiv 2609.37969, 29 September.