FLUX.2 [max]

FLUX.2 [max] is the most capable image model BFL has ever shipped - a 32-billion-parameter rectified flow transformer with up to 4-megapixel output and a dozen-or-so quality points over FLUX.1. The catch, if you've priced a GPU lately: it needs something like 18–24GB of VRAM even quantized, and running it locally is a whole machine's worth of commitment. The Runware route through this node just… skips that. The bfl:7@1 AIR is baked in; the denoising happens on their fleet.

There's a real irony the KB likes to point out: FLUX.2 won the benchmarks and still lost the community to Alibaba's smaller, Apache 2.0, uncensored Z-Image. On the API, though, you get the benchmark winner without the argument - this is the pure "I want the best FLUX.2 quality, now" node.

How it works

A taskType: imageInference REST call. The genuinely cool part: FLUX.2 generation and editing live in one model, and reference images ride in via the referenceImages socket (up to 10 of them). You can prompt it into both generating from scratch and editing from references with the same node.

Inputs that matter

• positivePrompt - required; everything else is optional.
• referenceImages - the differentiator. Feed one or several images and describe what to do with them. This is what turns a generation node into an editing node.
• width / height - 256–2048 in 16px steps. Native 4MP territory is here; go big if your use case wants it.
• providerSettings.bfl.promptUpsampling - prompt expander.
• providerSettings.bfl.safetyTolerance - 0–5, default 2; the BFL moderation dial.
• seed / numberResults - reproducibility and variants.

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. Prepaid top-up; per-run cost on the title bar.

Gotchas

• The max tier is the priciest image node in the pack. Quality is real, but it's the wrong tool for bulk iteration - draft cheap, finalize here.
• Moderation is BFL-side; safetyTolerance is your only knob.
• No steps/CFG widgets - provider-fixed, turnkey. If you want the dials, the pack's klein node has them.

FLUX.2 [max] is the "no compromises, no hardware" answer in this pack. It's also the answer the community quietly stopped choosing locally - but on the API, with nothing to download and nothing to license-wrangle, it's the cleanest way to touch the actual flagship.