Flux助手(高级)

Here's the honest pitch: local Flux is heavy. The dev model alone is over 30 GB of weights, and you need a serious card to run it happily. This node does the whole thing on Alibaba's hosted Flux endpoints instead - type a prompt, get a real Flux image out as an IMAGE tensor, and the only thing you downloaded was a few lines of Python. It's the fastest way to "run" Flux that exists, and for anyone on a modest GPU it's the only way.

Pick model from flux-schnell, flux-dev, or flux-merged. The advanced variant gives you the dials: seed (with a huge max), steps (leave at 0 and it auto-configures - the tooltip spells it out: schnell defaults to 4 steps, dev to 50, merged to 30), guidance (default 3.5, which tunes how tightly the output obeys the prompt - higher is more literal, lower is more creative), size from a 6-entry preset list (1024×1024, 512×1024, 768×512, 768×1024, 1024×576, 576×1024), and offload (a True/False toggle that offloads heavy components to CPU to ease memory pressure - the tooltip's recommendation, leave it False unless you're resource-limited). prompt is your prompt, and api_key is the pack's standard DashScope key.

The mechanism is a single dashscope.ImageSynthesis.call, and the returned image URL is downloaded and converted back into a ComfyUI tensor that lands on your GPU. Output: one IMAGE.

For the casual use case - you just want a Flux image and don't care about the dials - the "Flux助手(简易)" sibling in this pack is the same thing with steps, seed, guidance, and offload stripped out. This node is for when you want to lock a seed, tune guidance, or experiment with step counts on the hosted model.

Install: ComfyUI Manager → "ComfyUI-My-Nodes", or cd ComfyUI/custom_nodes && git clone https://github.com/Tagbliton/ComfyUI-My-Nodes and restart. The pack's requirements.txt installs dashscope, openai, requests, soundfile, numpy, and pins urllib3==1.26.20 - don't touch that pin.

Gotchas - and this is the one to remember: the README explicitly calls out that choosing flux-schnell here throws list index out of range, and it's currently unfixed. The workaround is to use flux-dev or flux-merged instead. Also keep the API framing in mind: this is metered pay-per-image via DashScope, so it's not free like local Flux is after the download, and getting a key at all requires a real-name-verified mainland China account - the single biggest reason people outside China can't make this node work.