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MiniMax H3

MiniMax H3 is an omni-modal generative video model with support for unified understanding of multimodal contexts composed of text, images, video, and audio, and can generate video with native stereo audio at resolutions up to 2K and durations of up to 15 seconds.

Note

MiniMax H3 is massive! 33B transformer and 32B text-encoder (qwen3-vl) combine to 134GB of model weights in bfloat16!

Important

See offloading and quantization sections below before attempting to load MiniMax-H3

Important

Video support requires ffmpeg to be installed and available in the PATH

Requirements

Due to size, MiniMax-H3 may not run properly on systems with less than 64GB of RAM
Depending on quantization and offloading methods, MiniMax-H3 can run comfortably on GPUs with as little as 16GB of VRAM

Quantization

Tip

SD.Next provides access to SDNQ pre-quantized weights in uint4 precision which reduces the model size to 47GB

To use pre-quantized weights, simply select them from model selection dropdown

If you choose to use non-quantized weights, you should enable desired quantization

For more information see Quantization Wiki and SDNQ Wiki

Offloading

Balanced offloading

SD.Next default offload method is balanced offloading which is the best starting point for most models. However, MiniMax-H3 is so massive that it may require more aggressive offloading to fit into your GPU memory

with balanced offloading, MiniMax-H3 requires a GPU with at least 24GB of VRAM.

Group offloading

recommended offload method for MiniMax-H3 is group offloading which allows MiniMax-H3 to run on a GPU with as little as 16GB of VRAM.

Tip

group offloading is a more aggressive offload method which does result in some performance loss, but it is the only way to run MiniMax-H3 on GPUs with less than 24GB of VRAM.

for more information see Offloading Wiki

Variants

MiniMax H3 has two separate variants which use different transformers weights: - base: fl2va: used for text-to-video, image-to-video and first-last-frame-to-video video generation - ref: ref2va: used for reference-based video generation

both base and ref variants use the same text-encoder weights, but have different transformer weights

pruned: Also, both base and ref variants are available in a pruned variant which is slightly smaller as parts of the transformer model are pruned/removed.

depending on which variant you load, you will have access to different workflows

Base workflows

available if base model is loaded - prompting guide - text-to-video is used when there are no input images provided - image-to-video is used when a single input image is provided - first-last-frame-to-video is used when two input images are provided

Ref workflows

available if ref model is loaded - prompting guide - reference-to-video

in ref2va workflow, you can upload any combination of: - 9 reference images - 3 reference videos - 3 reference audio files

total number of reference media must be up to 12 files
lengths of reference videos and audio files must be up to duration of generated video

Image workflows

everything as above except that MiniMax-H3 can also be used as a regular text-to-image/image-to-image model, not limited to Video generation
to use MiniMax-H3 as a t2i/i2i model, simply select it from the networks -> reference and use as any other model

Turbo LoRA

MiniMax-H2 can be used with Turbo LoRA to reduce steps from base 30-50 down to 4-8 steps only!

Warning

Turbo LoRA is not compatible with pruned variant!

Due to pending lawsuit, MiniMax-H3 license comes with a disclaimer