Swarm natively supports ModelSpec metadata and can import metadata from some legacy formats used by other UIs (auto webui thumbnails, matrix jsons, etc)
Swarm supports models of all the common architectures:
SDv1/SDv2 models work exactly as normal. Even legacy (pre-ModelSpec models are supported).
SDXL models work as normal, with the bonus that by default enhanced inference settings will be used (eg scaled up rescond).
Additional, SDXL-Refiner architecture models can be inferenced, both as refiner or even as a base (you must manually set res to 512x512 and it will generate weird results).
Turbo models work the same as regular models, just set CFG Scale to 1 and Steps to 1 as well. Under the ComfyUI group set Scheduler to Turbo.
LCM models work the same as regular models, just set CFG Scale to 1 and Steps to 4. Under the ComfyUI group set Sampler to lcm.
SegMind SSD-1B models work the same as SD models.
SVD models are supported via the "Video" parameter group. Like XL, video by default uses enhanced inference settings (better sampler and larger sigma value).
You can do text2video by just checking Video as normal, or image2video by using an Init Image and setting Creativity to 0.
Stable Cascade is supported if you use the "ComfyUI Format" models (aka "All In One") https://huggingface.co/stabilityai/stable-cascade/tree/main/comfyui_checkpoints that come as a pair of stage_b and stage_c models.
You must keep the two in the same folder, named the same with the only difference being stage_b vs stage_c in the filename.
Either model can be selected in the UI to use them, it will automatically use both.