ComfyUI Checkpoint Iterator

A custom node for ComfyUI that allows you to easily iterate through all of your downloaded checkpoints sequentially or dynamically. This is extremely useful for testing prompts or settings against a large batch of different models without manually changing the checkpoint loader node each time.

Installation

1. Navigate to your ComfyUI custom_nodes directory.

   cd ComfyUI/custom_nodes
   

2. Clone this repository (or copy the folder into the custom_nodes directory).

   git clone https://github.com/yourusername/ComfyUI-Checkpoint-Iterator.git
   

3. Restart ComfyUI.

Usage

1. In the ComfyUI canvas, right-click and go to Add Node -> loaders -> Checkpoint Loader Iterator.
2. Right-click the newly added node and select Convert batch_index to input.
3. Add a Primitive Node (Add Node -> utils -> Primitive).
4. Connect the Primitive node to the batch_index input of the Checkpoint Loader.
5. Select the Primitive node in the UI and set its control_after_generate behavior from fixed to increment.
6. Set the Batch count in the ComfyUI main control panel to the number of checkpoints you want to test (e.g., 10, 30).
7. Click Queue Prompt.

How it works

For each image generated in the batch queue, the Primitive node will increment the batch index by 1. The custom node calculates index % total_checkpoints to select the corresponding checkpoint from your models folder and loads it.

Outputs

• MODEL, CLIP, VAE: The standard outputs required for ComfyUI workflows.
• CKPT_NAME: (String) The exact filename of the checkpoint currently loaded. You can route this string into a custom "Save Image" node to automatically include the model name in your generated image filenames for easy comparison.

License

MIT License