☁️BizyAir MinusZone - KolorsUNETLoaderV2

What it is

The name says "Kolors" but don't let that fool you - this has grown into BizyAir's general-purpose diffusion model loader. Look at the actual checkpoint list and you'll find Wan 2.2 (T2V and I2V, fp8), Flux Kontext, Flux Schnell and Dev, PixelWave, and, yes, Kolors itself. The "MZ" in the class name credits MinusZoneAI, whose original ComfyUI-Kolors-MZ node pack BizyAir built this on - the README's own changelog thanks them by name.

Kolors itself is worth knowing about even though it's mostly a footnote now. Kuaishou (the company behind TikTok's Chinese rival Kwai) released it in mid-2024 with an unusual design: a UNet backbone paired with ChatGLM3 as the text encoder instead of CLIP or T5, which gave it genuinely strong Chinese-language prompt handling. The community reception was warm - "Kwai Kolors is really good!" was a real reaction - but it launched right as Flux was landing, and investment simply moved on. The KB files it under "forgotten models": not bad, just outrun by timing.

How it works

Point this node at a checkpoint file and it loads that model on BizyAir's cloud hardware, output ready to feed into the rest of a BizyAir sampling chain. Which architecture you actually get - Kolors, Flux, or Wan - depends entirely on which filename you pick from the dropdown, so this node's behavior is really defined by what you load into it, not by the "Kolors" name on the tin.

Inputs and outputs that matter

There's exactly one required input: unet_name, an enum of checkpoint filenames. The sample list runs from shuttle-3.1-aesthetic.safetensors and Wan 2.2's fp8-scaled T2V/I2V variants through Flux Kontext, Kolors and Kolors-Inpainting, and a few Flux base builds - 15 choices total in the brief, with more beyond what's shown. Check the live dropdown in ComfyUI rather than assuming this list is exhaustive; BizyAir adds models as they ship.

The single output, model, is typed BIZYAIR_MODEL - it only connects downstream to other BizyAir nodes (samplers, text encoders, and the like), not to a stock ComfyUI KSampler.

Installing it

Install via ComfyUI Manager (search "BizyAir") or clone directly: cd ComfyUI/custom_nodes && git clone https://github.com/siliconflow/BizyAir.git, then restart ComfyUI. You need a BizyAir API key configured before this node - or anything else in the pack - will load a model; the login prompt on first run walks you through getting one.

Common issues

The biggest trap is picking a checkpoint whose architecture doesn't match the rest of your chain - a Kolors UNet needs Kolors' own conditioning path, and a Flux checkpoint needs Flux-shaped text encoding (see BizyAir_CLIPTextEncodeFlux in this same pack), so mixing a loaded model from one family with encoder or sampler nodes built for another will produce broken output rather than a clear error. If the dropdown looks shorter than expected or a model you were told about isn't there, that's usually a sync issue with your BizyAir account rather than something wrong locally - the list reflects what BizyAir currently hosts, not a static file on disk. And since Kolors specifically is a lower-priority, older architecture in an ecosystem that's mostly moved on, don't expect the same volume of community troubleshooting threads for Kolors-specific issues that you'd find for Flux or Wan.