ComfyUI ships day-zero support for the open-weights MiniMax H3 video model and reports cutting its memory footprint 66 percent, from 123.6 GB to 42.5 GB

Sources: ComfyUI blog post, HN discussion
Summary: ComfyUI published day-zero support for MiniMax H3 and reports cutting the model's memory footprint 66 percent, from 123.6 GB in full precision to 42.5 GB with the smallest model variants. The post states that the modulation weights it replaced with a functionally equivalent lookup table are about 40 percent of the total parameters, and pairs that replacement with an int8 convrot quantization and custom kernels. H3 is MiniMax's third-generation video model and the first the company has released with open weights. ComfyUI is first-party for its own integration and optimization figures and is relaying MiniMax's claims about the model itself, and no MiniMax first-party page was in the day's collection.
Why it matters: The pruning and quantization work rather than the weights release is what decides whether a 2K video model runs on one GPU.
Follow-up: Resolve a MiniMax first-party page for the model claims and check the parameter and footprint figures against it.