☁️BizyAir Load Upscale Model

This is a loader, and only a loader - it doesn't upscale anything by itself. It picks one of the ESRGAN-family upscale models BizyAir hosts and hands it off to whichever upscale-with-model node comes next in your chain. If you've used ComfyUI's core "Load Upscale Model" node before, the concept is identical; the difference is entirely in where the model actually runs.

These GAN-based upscalers (the RealESRGAN family and NMKD's variants) are the standard second stage in most upscale pipelines: generate or sample at a workable resolution, then run a dedicated upscale model over the result to add sharpness and detail rather than just interpolating pixels. They're fast, cheap, and don't need a full diffusion pass to work.

Inputs and outputs

One required input: model_name, an enum of the upscale checkpoints BizyAir has available. The sample list gives a good sense of the range: 4x_NMKD-Siax_200k.pth (a popular general-purpose 4x model), RealESRGAN_x4plus.pth and RealESRGAN_x2plus.pth (Real-ESRGAN's general photo models at two scale factors), and RealESRGAN_x4plus_anime_6B.pth (the anime/illustration-tuned variant, worth reaching for specifically if your source is anime-style rather than photographic - the general model tends to over-smooth line art).

Output is BIZYAIR_UPSCALE_MODEL - note the custom type. This doesn't match ComfyUI's stock UPSCALE_MODEL type, so it only connects to BizyAir's own upscale-with-model node downstream, not the core ComfyUI one. If you're building a mixed workflow, keep this loader paired with BizyAir's matching upscale node rather than trying to wire it into a non-BizyAir upscaler.

Installing BizyAir

Through ComfyUI Manager: search "BizyAir," install. Or clone it manually:

cd ComfyUI/custom_nodes && git clone https://github.com/siliconflow/BizyAir.git

Restart ComfyUI, or run comfy node install bizyair via Comfy-CLI. Set your API key on first use through the README's "click to login" link - like every loader in this pack, the model itself lives and runs on SiliconFlow's cloud rather than as a file on your disk.

Common issues

The type mismatch is the thing that trips people up first: if you already have an upscale-with-model node in your graph from ComfyUI core or another pack, this loader's BIZYAIR_UPSCALE_MODEL output won't connect to it. You need the BizyAir-specific upscale node on the other end.

Picking the wrong model for your content is the second most common issue - a photorealistic upscaler run over anime or flat illustration tends to introduce mushy, over-detailed textures where the source had clean lines, and the anime-tuned model does the reverse on photos. Match the model to your content type before assuming a bad result means the pipeline is broken.

As always, if nothing loads or the node errors silently, check your API key before anything else.