CheckpointSave - ComfyUI Built-in Node Documentation

The Save Checkpoint node is designed to save a complete Stable Diffusion model (including UNet, CLIP, and VAE components) as a .safetensors format checkpoint file. The Save Checkpoint is primarily used in model merging workflows. After creating a new merged model through nodes like ModelMergeSimple, ModelMergeBlocks, etc., you can use this node to save the result as a reusable checkpoint file.

Inputs

Parameter	Description	Data Type
`model`	The model parameter represents the primary model whose state is to be saved. It is essential for capturing the current state of the model for future restoration or analysis.	MODEL
`clip`	The clip parameter is intended for the CLIP model associated with the primary model, allowing its state to be saved alongside the main model.	CLIP
`vae`	The vae parameter is for the Variational Autoencoder (VAE) model, enabling its state to be saved for future use or analysis alongside the main model and CLIP.	VAE
`filename_prefix`	This parameter specifies the prefix for the filename under which the checkpoint will be saved.	STRING

Additionally, the node has two hidden inputs for metadata: prompt (PROMPT): Workflow prompt information extra_pnginfo (EXTRA_PNGINFO): Additional PNG information

Outputs

This node will output a checkpoint file, and the corresponding output file path is output/checkpoints/ directory

Architecture Compatibility

Currently fully supported: SDXL, SD3, SVD and other mainstream architectures, see source code
Basic support: Other architectures can be saved but without standardized metadata information

Related source code: nodes_model_merging.py#L227

This documentation was AI-generated. If you find any errors or have suggestions for improvement, please feel free to contribute! Edit on GitHub

​Inputs

​Outputs

​Architecture Compatibility

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Inputs

Outputs

Architecture Compatibility

Related Links