MiniMax-H3 INT8 FLF, R2V & TTS Workflows Collection

Optimized ComfyUI workflows for MiniMax-H3, featuring INT8 inference, Sage-Attention, Spectrum, Lightx2v LoRA, Turbo-LoRA, native Extend support, Face Refine, and high-speed Text-to-Speech.

Workflows

Workflow	File	Description
First-Last-Frame (FLF)	`MiniMax_int8_I2V-javanoYYMM.x.json`	FLF video generation with native Extend support.
Reference-to-Video (R2V)	`MiniMax_int8_R2V-javanoYYMM.x.json`	Reference-guided video generation with a dedicated reference LoRA and native Extend support.
Face Refine	`MiniMax_int8_FR-javano2608.1.json`	Face refinement workflow for correcting and enhancing faces in generated video.
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.

ComfyUI-SolAttn_triton
https://github.com/kijai/ComfyUI-SolAttn_triton

Spectrum

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

Optimized sampling and MiniMax-H3 inference acceleration.

Lightx2v LoRA

lightx2v/Minimax-h3-Turbo
https://huggingface.co/lightx2v/Minimax-h3-Turbo

Acceleration LoRA for reduced sampling steps and faster MiniMax-H3 video generation.

Turbo-LoRA

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.

Native Extend

MiniMax-H3 supports video extension natively, allowing existing video content to be extended directly within the workflow.

This can be used to continue generated videos while maintaining temporal and visual continuity.

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.

Face Refine

ComfyUI-H3-FaceRefine
https://github.com/Carasibana/ComfyUI-H3-FaceRefine

Provides automatic face refinement for generated video, similar to a Face Detailer workflow.

Features:

Automatic face detection
Face refinement
Facial detail enhancement
Improved facial consistency
Video face correction

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
Native Extend support
INT8
Sage-Attention
Spectrum
Lightx2v LoRA
Optional Turbo-LoRA

Recommended for:

Cinematic transitions
Character animation
Camera movement
Transformations
Keyframe-based video generation

Reference-to-Video (R2V)

`MiniMax_int8_R2V-javanoYYMM.x.json`

Generates video from a reference image with dedicated reference LoRA conditioning and native Extend support.

Features:

Reference image conditioning
Reference LoRA
Character/appearance consistency
Native Extend support
INT8
Sage-Attention
Spectrum
Lightx2v LoRA
Optional Turbo-LoRA

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.

Face Refine

`MiniMax_int8_FR-javano2608.1.json`

A dedicated face refinement workflow for MiniMax-H3 generated video.

Uses:

ComfyUI-H3-FaceRefine
https://github.com/Carasibana/ComfyUI-H3-FaceRefine

The workflow automatically detects and refines faces in the generated video, providing a Face Detailer-like correction process.

Recommended for:

Facial detail enhancement
Correcting facial artifacts
Improving face consistency
Refining generated characters

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-SolAttn_triton
https://github.com/kijai/ComfyUI-SolAttn_triton
ComfyUI-Spectrum-MiniMax-H3
https://github.com/xmarre/ComfyUI-Spectrum-MiniMax-H3
ComfyUI-H3-FaceRefine
https://github.com/Carasibana/ComfyUI-H3-FaceRefine

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

lightx2v/Minimax-h3-Turbo
https://huggingface.co/lightx2v/Minimax-h3-Turbo

Used for accelerated video generation with reduced sampling steps.

Optional Turbo-LoRA

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

Used for experimental low-step acceleration.

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 lightx2v/Minimax-h3-Turbo if using Lightx2v acceleration.
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_FR-javano2608.1.json — Face Refine
- 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, LoRA strength, and desired output quality.

Notes

FLF = First-Last-Frame.
R2V = Reference-to-Video.
FR = Face Refine.
TTS = Text-to-Speech.
Extend is natively supported by MiniMax-H3.
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.
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.

Motion Context Compatibility Note

The ComfyUI-H3-Motion-Context custom node is no longer required by the latest workflows.

Starting with:

I2V: 2608.9
R2V: 2608.16

Motion Context has been replaced with the native MiniMaxH3AddGuide node. Therefore, ComfyUI-H3-Motion-Context is no longer required for the latest workflow versions.

Additional Resources

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

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

Sol-Attn
https://github.com/kijai/ComfyUI-SolAttn_triton

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

H3 Face Refine
https://github.com/Carasibana/ComfyUI-H3-FaceRefine

Lightx2v LoRA
https://huggingface.co/lightx2v/Minimax-h3-Turbo

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

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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