FLUX.1.1 [pro] Ultra

You've seen the banana. "Nano Banana" - the community name for FLUX.1.1 [pro] Ultra - is the fastest, most photorealistic image model Black Forest Labs has ever shipped, and it's closed-weights, API-only, and genuinely impressive at real-world photography. Faces, skin, materials, lighting: it reads as a photo in a way that the open FLUX tiers never quite managed. The "Nano" part is the speed (it's fast - sub-second class in good conditions), and the "Banana" part is the banana. This node is that API as a ComfyUI node, via Runware.

It's the natural upgrade path from the plain [pro] node: same family, same wiring, better photorealism and a couple of extra dials.

How it works

A thin taskType: imageInference REST call with model AIR bfl:2@2. Runware runs the closed BFL model and hands back an IMAGE tensor. All the smarts are proprietary; your job is just prompt, size, and the two BFL-specific toggles.

Inputs that matter

• positivePrompt - required. Write it like a photograph you're describing to a very literal assistant.
• width / height - default 1024; no stated range in the schema, and Ultra handles high resolution natively, so feel free to go big.
• providerSettings.bfl.raw - the interesting one. On, you get the direct model output with no post-processing. Off, BFL's polishing pipeline smooths things for that extra "finished photo" feel. People who like crisp, filmic realism tend to like raw on; people who want the glossy default leave it off.
• providerSettings.bfl.promptUpsampling - prompt expansion, off by default.
• providerSettings.bfl.safetyTolerance - 0–5, default 2; the moderation dial, same as the rest of the BFL pro family.
• seed / numberResults - reproducibility and cheap variations.

Install

cd ComfyUI/custom_nodes
git clone https://github.com/Runware/ComfyUI-Runware
pip install -r ComfyUI-Runware/requirements.txt

Or ComfyUI Manager → search Runware → Install → restart. API key in ComfyUI Settings → Runware API key or RUNWARE_API_KEY.

Gotchas

• It's the premium tier, so watch the per-run cost. The title bar shows it - use it to keep track before a long batch surprises you.
• Moderation is BFL-side and adjustable only through safetyTolerance.
• Photorealism this good is a double-edged sword: it'll reproduce real people's likenesses convincingly, and BFL's moderation is exactly why. Don't be that person.

If "it looks like a photo" is the actual requirement, this is the node in the pack that delivers it fastest. The raw toggle is the one setting worth experimenting with - it changes the character of the output more than anything else on the node.