CFG Scale (Classifier-Free Guidance)
Controls how strongly the sampler forces the image toward your positive prompt and away from the negative prompt.
Updated Oct 17, 2026 · 1 min read
- Term
- CFG Scale (Classifier-Free Guidance)
- In Short
- Controls how strongly the sampler forces the image toward your positive prompt and away from the negative prompt.
- Applies To
- ComfyUI SD 1.5, SDXL, Flux & Video
Definition: CFG Scale (Classifier-Free Guidance)
Controls how strongly the sampler forces the image toward your positive prompt and away from the negative prompt.
For SD 1.5 and SDXL, typical CFG values sit between 5.0 and 8.0. For Flux.1 Dev, the KSampler CFG is set to 1.0 while the FluxGuidance node controls distillation guidance around 3.5.
How to tune this in your ComfyUI workflow
Every parameter in ComfyUI is exposed directly on its node rather than hidden behind global settings tabs. You can inspect or override this behavior per pass in ComfyUI Studio.
New to node graphs? Grab the Windows installer at /download and open a built-in template from the workflow menu.
FAQs
What does CFG Scale (Classifier-Free Guidance) do in ComfyUI?
Controls how strongly the sampler forces the image toward your positive prompt and away from the negative prompt. For SD 1.5 and SDXL, typical CFG values sit between 5.0 and 8.0. For Flux.1 Dev, the KSampler CFG is set to 1.0 while the FluxGuidance node controls distillation guidance around 3.5.
Where do I adjust this setting on the canvas?
Check the corresponding loader or KSampler widget in your active workflow graph.
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