MiniMax-H3 INT8 FLF, R2V & TTS Workflows Collection

Optimized ComfyUI workflows for MiniMax-H3, featuring INT8 inference, Sage-Attention, Spectrum, Lightx2v LoRA, experimental Turbo-LoRA, Motion Context, Latent Upscaling, and high-speed Text-to-Speech.

Workflows

Workflow	File	Description
First-Last-Frame (FLF)	`MiniMax_int8_I2V-javanoYYMM.x.json`	FLF video generation with Motion Context.
Reference-to-Video (R2V)	`MiniMax_int8_R2V-javanoYYMM.x.json`	Reference-guided video generation with Motion Context and a dedicated reference LoRA.
Text-to-Speech (TTS)	`MiniMax_int8_TTS-javanoYYMM.x.json`	High-speed Text-to-Speech using MiniMax-H3 with audio-only output.

Base model:
Comfy-Org/MiniMax-H3
https://huggingface.co/Comfy-Org/MiniMax-H3

Features

INT8

INT8 MiniMax-H3 inference for:

Reduced VRAM usage
Faster inference
Improved memory efficiency

Sage-Attention

Optimized attention implementation for faster MiniMax-H3 inference and improved generation throughput.

Spectrum

ComfyUI-Spectrum-MiniMax-H3
https://github.com/xmarre/ComfyUI-Spectrum-MiniMax-H3

Optimized sampling and MiniMax-H3 inference acceleration.

Motion Context

ComfyUI-H3-Motion-Context
https://github.com/NikoDemon80/ComfyUI-H3-Motion-Context

Provides additional temporal motion conditioning for FLF and R2V workflows.

Lightx2v LoRA

Kijai/MiniMax-H3_comfy
https://huggingface.co/Kijai/MiniMax-H3_comfy

Optional acceleration LoRA for reduced sampling steps and faster generation.

Turbo-LoRA (Experimental)

MiniMax-H3-Turbo-Lora-ComfyUI
https://huggingface.co/drbaph/MiniMax-H3-Turbo-Lora-ComfyUI

Experimental low-step acceleration. Output quality may vary depending on LoRA strength and sampling settings.

R2V Reference LoRA

The R2V workflow requires the following reference LoRA:

minimax_h3_ref_lora_rank_256_bf16.safetensors
https://huggingface.co/Kijai/MiniMax-H3-experimental/tree/main/loras

This LoRA provides the reference-image conditioning required by the R2V workflow.

Latent Upscaler

ComfyUI-MiniMaxH3_LatentUpscaler
https://github.com/Tr1dae/ComfyUI-MiniMaxH3_LatentUpscaler

Post-generation latent video upscaling for higher resolution and improved detail.

Text-to-Speech

MiniMax-H3 can also be used as a dedicated Text-to-Speech engine.

The TTS workflow generates audio only, bypassing video generation entirely. This significantly reduces processing requirements and enables extremely fast speech synthesis.

Workflow Details

First-Last-Frame (FLF)

`MiniMax_int8_I2V-javanoYYMM.x.json`

Generates controlled transitions between a first and last frame.

Features:

First + Last Frame conditioning
Motion Context
INT8
Sage-Attention
Spectrum
Lightx2v LoRA
Optional Turbo-LoRA
Latent Upscaler

Recommended for cinematic transitions, character animation, camera movement, transformations, and keyframe-based video generation.

Reference-to-Video (R2V)

`MiniMax_int8_R2V-javanoYYMM.x.json`

Generates video from a reference image with dedicated reference LoRA and Motion Context conditioning.

Features:

Reference image conditioning
Reference LoRA
Character/appearance consistency
Motion Context
INT8
Sage-Attention
Spectrum
Lightx2v LoRA
Optional Turbo-LoRA
Latent Upscaler

Recommended for:

Character videos
Consistent subjects
Appearance preservation
Image-driven animation
Reference-guided video generation

Required R2V LoRA

minimax_h3_ref_lora_rank_256_bf16.safetensors

Download from:

https://huggingface.co/Kijai/MiniMax-H3-experimental/tree/main/loras

Place the LoRA in the appropriate ComfyUI LoRA directory and load it in the R2V workflow.

Text-to-Speech (TTS)

`MiniMax_int8_TTS-javanoYYMM.x.json`

A dedicated Text-to-Speech workflow using MiniMax-H3.

The workflow outputs audio only, without generating video frames. By bypassing the video generation pipeline, it enables extremely fast speech synthesis with significantly lower processing requirements.

Features:

Text-to-Speech using MiniMax-H3
Audio-only output
INT8 inference
Fast speech generation
ComfyUI workflow integration

Recommended for:

Voice generation
Dialogue creation
Voice-over production
Rapid audio prototyping
Generating speech for video production

Required Custom Nodes

ComfyUI-Spectrum-MiniMax-H3
https://github.com/xmarre/ComfyUI-Spectrum-MiniMax-H3
ComfyUI-H3-Motion-Context
https://github.com/NikoDemon80/ComfyUI-H3-Motion-Context
ComfyUI-MiniMaxH3_LatentUpscaler
https://github.com/Tr1dae/ComfyUI-MiniMaxH3_LatentUpscaler

Install through ComfyUI Manager → Install Missing Custom Nodes.

Required Models

Main Model

Comfy-Org/MiniMax-H3
https://huggingface.co/Comfy-Org/MiniMax-H3

R2V Reference LoRA

minimax_h3_ref_lora_rank_256_bf16.safetensors
https://huggingface.co/Kijai/MiniMax-H3-experimental/tree/main/loras

Required for the R2V workflow.

Lightx2v LoRA

Kijai/MiniMax-H3_comfy
https://huggingface.co/Kijai/MiniMax-H3_comfy

Optional Turbo-LoRA

MiniMax-H3-Turbo-Lora-ComfyUI
https://huggingface.co/drbaph/MiniMax-H3-Turbo-Lora-ComfyUI

Installation

Update ComfyUI and ComfyUI-Manager.
Install the required custom nodes listed above.
Download Comfy-Org/MiniMax-H3.
For R2V, download:
- minimax_h3_ref_lora_rank_256_bf16.safetensors
Download Kijai/MiniMax-H3_comfy if using Lightx2v.
Download MiniMax-H3-Turbo-Lora-ComfyUI if using Turbo-LoRA.
Load the desired workflow:
- MiniMax_int8_I2V-javanoYYMM.x.json — FLF
- MiniMax_int8_R2V-javanoYYMM.x.json — R2V
- MiniMax_int8_TTS-javanoYYMM.x.json — TTS

Recommended Configuration

High-Speed Configuration:
INT8 + Sage-Attention + Lightx2v LoRA or Turbo-LoRA

The optimal configuration may vary depending on the workflow, GPU, sampling settings, and desired output quality.

Notes

FLF = First-Last-Frame.
R2V = Reference-to-Video.
TTS = Text-to-Speech.
Motion Context supports both FLF and R2V.
The R2V workflow requires minimax_h3_ref_lora_rank_256_bf16.safetensors.
The TTS workflow outputs audio only and does not generate video.
Turbo-LoRA is experimental.
Sage-Attention and Spectrum require compatible environments.
Combining multiple acceleration methods may require tuning of sampling steps and LoRA weights.
Latent Upscaler can be used after video generation when higher output resolution is required.
If audio is not generated correctly, try lowering the shift_audio value of the ModelSamplingMiniMaxH3 node inside the INT8 Model Loader subgraph from 4.00 to 3.00.

Additional Resources

MiniMax-H3
https://huggingface.co/Comfy-Org/MiniMax-H3

R2V Reference LoRA
https://huggingface.co/Kijai/MiniMax-H3-experimental/tree/main/loras

Spectrum MiniMax-H3
https://github.com/xmarre/ComfyUI-Spectrum-MiniMax-H3

H3 Motion Context
https://github.com/NikoDemon80/ComfyUI-H3-Motion-Context

Lightx2v LoRA
https://huggingface.co/Kijai/MiniMax-H3_comfy

MiniMax-H3-Turbo-Lora-ComfyUI
https://huggingface.co/drbaph/MiniMax-H3-Turbo-Lora-ComfyUI

MiniMax-H3 Latent Upscaler
https://github.com/Tr1dae/ComfyUI-MiniMaxH3_LatentUpscaler

License

Please follow the respective licenses of MiniMax-H3, ComfyUI, the listed custom nodes, LoRAs, and other third-party components used by these workflows.

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