Flux Kontext Pro Text To Image (Channel Edition)

Kontext Pro is the tier that normally never leaves BFL's API. The open-weights release was Dev; Pro and Max stayed hosted. What this node does is hand you a Kontext Pro generation channel through BizyAir's own infrastructure - so the "Pro" in the name isn't marketing fluff stapled onto a Dev download, it's the actual top tier, running somewhere you don't have to own.

This is the text-to-image side: no image input, just a prompt and an aspect ratio. Pure generation. If you've read the Kontext story - the instruction-based 12B family where reference images are consumed in-context - this node skips the "reference" part entirely and lets you lean on the underlying model's raw quality for prompt-to-picture work.

Inputs and outputs

• prompt - required. Natural language. Kontext is guidance-distilled from the Pro line, and it parses full sentences cleanly. A structured sentence like "a foggy harbor at dawn, fishing boats silhouetted against a pale sun" will outclass a tag list every time.
• aspect_ratio - dropdown, default 21:9. The ultra-wide default again - Pro's hosted default clearly lives on cinematic wides, and that's a hint about what it's tuned for.

Outputs: image, request_id, urls. The standard BizyAir triple; wire the image into a Save Image.

How it works

Same as every BizyTRD_*_API node: the pack serializes your prompt, calls the hosted flux-kontext-pro-base/text-to-image endpoint, polls until the render completes, and pulls the result back into your graph. API key from BizyAirPlus settings or BIZYAIR_API_KEY, unless you override it per-request with a settings node. No model files ever touch your disk - which is the entire point of a Pro channel you can't download.

When it's worth the credits

Here's the honest cost-benefit. If you already run Flux locally and just want images, Kontext Pro T2I is a premium you don't need - local Flux Dev gets you most of the way for free. This node earns its credits in the specific case where you want Kontext-quality, Pro-tier output without committing to the 12B stack, and where the 21:9 cinematic default is genuinely your aesthetic. It's also the natural pairing if you're building a hosted pipeline where everything else in the graph is already cloud-side.

Troubleshooting

• Output ignores your prompt: check for tag-soup writing. This family rewards sentences.
• Red placeholder with error text: the pack's skip_error failure mode. Read the console and the urls output for the actual error.

Install

With the pack:

cd /path/to/ComfyUI/custom_nodes
git clone https://github.com/siliconflow/BizyAirPlus.git
cd BizyAirPlus
python -m pip install -r requirements.txt

Restart ComfyUI, make sure BizyAirPlus is ON and keyed, and keep the 21:9 default in mind. Pro came pre-tuned for widescreen, and there's no shame in letting the hosted default do its thing.