Model Merging Workflow

Learn to merge multiple models in ComfyUI.

Model Merging Basics

Model merging combines strengths of multiple models.

Merge Types

Type	Description
Weight Average	Direct weighted average
Interpolation	Proportional mix

Merge Tools

Official Merge

ComfyUI has built-in merge tools:

Node: ModelMergeSimple
     ModelMergeSDXL

Merge Workflow

┌─────────────┐    ┌─────────────┐
│ CheckpointL │    │ CheckpointL │
│ oader (A)   │    │ oader (B)   │
└──────┬──────┘    └──────┬──────┘
       │                  │
       ↓                  ↓
┌──────────────────────────────┐
│        ModelMergeSimple       │
│        (ratio: 0.5)          │
└──────────────────┬───────────┘
                   ↓
            ┌─────────────┐
            │ SaveCheckpoint │
            └─────────────┘

Parameters

Weight Ratio

Value	Effect
0.0	Complete model A
0.5	50% each
1.0	Complete model B

Recommended Ratios

Goal	Ratio
Keep A style	0.2-0.3
Balance	0.4-0.6
Closer to B	0.7-0.8

SDXL Merge

SDXL Merge Node

Use SDXL-specific merge node:

Node: ModelMergeSDXL

Input:
- model_a: SDXL model A
- model_b: SDXL model B
- ratio: Merge ratio

Output:
- merged_model: Merged model

SDXL Notes

Note	Description
Model version	Must both be SDXL
VAE	Use SDXL-specific VAE

Save Model

Save Merged Result

Node: SaveCheckpoint

Save location:
ComfyUI/models/checkpoints/

Test Merged Results

Generate Comparison

1. Use same prompts
2. Generate tests separately
3. Compare quality
4. Adjust ratio

Troubleshooting

Q: Merged model won't work

A:

• Check model versions are compatible
• Ensure correct format (safetensors)
• Restart ComfyUI

Q: How to choose ratio

A:

• Start with 0.5 for testing
• Adjust based on results

Next Steps

• Workflow Index - More workflows
• SDXL - SDXL usage