ModelAttentionBackend - ComfyUI Built-in Node Documentation

This node selects the dense attention implementation for a model, clones the model, applies the chosen backend, and returns the patched clone.

This node selects the dense attention implementation for a model, clones the model, applies the chosen backend, and returns the patched clone. When used with Block Sparse Attention, this backend is used whenever sparse attention is inactive or unsupported. If the selected backend is unavailable, the node automatically falls back to PyTorch attention.

Inputs

Parameter	Description	Data Type	Required	Range
model	The model to patch.	MODEL	Yes
attention	The dense attention backend to apply. Comfy Kitchen attention uses quantized INT8 attention and is available only on Nvidia and AMD GPUs. Default: “pytorch attention”. If the selected backend is unavailable, PyTorch attention is used as a fallback.	COMBO	Yes	”pytorch attention" "comfy kitchen attention”

Note: The “comfy kitchen attention” option is only listed when the Comfy Kitchen INT8 attention module is available in the current environment.

Outputs

Output Name	Description	Data Type
model	A clone of the input model with the selected attention backend applied.	MODEL

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