MiniMax H3: A New Open-Weight Multimodal Video Model Integrated into ComfyUI
MiniMax has released H3 (Hailuo 3.0), an open-weight multimodal video generation model that natively generates up to 15-second videos with synchronized stereo audio, which is now available for local deployment via ComfyUI. This release is significant because it jointly generates synchronized audio and video in a single architecture rather than adding audio post-generation, and its open-weight nature combined with ComfyUI integration makes advanced video generation accessible for local experimentation. While the hosted version of MiniMax H3 supports up to 2K resolution, the locally deployable open-weight checkpoints are limited to 768p resolution for clips up to 15 seconds. The model can process text, images, video, and audio together as a single context for tasks like image-to-video and instruction-based editing.
## BACKGROUND
Open-weight AI models provide public access to the trained parameters (weights), allowing developers to run and customize them locally without relying on proprietary cloud APIs. ComfyUI is a popular open-source, node-based graphical user interface that enables users to build modular workflows for generative AI models, particularly diffusion models. Traditionally, AI video generation required separate models for video and audio, often leading to synchronization issues.