Comflowy Flux Pro Ultra

Flux Pro Ultra is Black Forest Labs' high-resolution flagship - the model you can't download, can't run locally, and can't even buy per-API-call without going through a provider. This node is Comflowy's door to it from inside ComfyUI: one node, a prompt, and the server hands back an image at a much higher resolution than the base Flux Pro models manage. It's the "I need the sharp, print-worthy version" button in this pack.

The README adds one tip worth taking seriously: set raw to true and the output is more realistic and detailed - less processed, more natural. That's the single highest-leverage setting on this node.

The meter: about 600 credits per image, per the README. That's the top of the pack's image pricing, which tracks - it's their highest-end model. This is a "hero shot" node, not a draft machine.

How it works and the inputs

Standard FlowyApiNode mechanics: prompt and settings POSTed to app.comflowy.com/api/open/v0/flowy, output URL downloaded and converted to an IMAGE tensor. The interesting part is that a higher-resolution model means the resolution control is coarse - you pick a shape, not a pixel count.

• prompt (required, multiline) - Flux-family prompting; describe what you want, it follows well.
• image_size (required) - seven aspect presets: 21:9, 16:9, 4:3, 1:1, 3:4, 9:16, 9:21. No free-form custom size here, which is normal for the hosted Ultra tier - the model outputs at its own high native resolution.
• raw (required, boolean, default false) - the "less processed, more natural-looking images" switch from the README. Try it on for anything photoreal; it dials back the baked-in polish that makes some Flux output look a bit CGI.
• seed - 0 to 2^31-1.
• safety_tolerance - 1 to 6, content-filter tolerance.
• num_images - 1 to 4 (integer, default 1). Billed per image.

Output: a single IMAGE.

Installing and what to watch for

Install Comflowy's Custom Nodes via ComfyUI Manager (search "Comflowy") or git clone https://github.com/6174/comflowy-nodes into custom_nodes, restart, and set your key with the Comflowy Set API Key node before anything else. Dependency: just requests. No models, no downloads - everything runs on the server.

The usual pack gotchas apply:

• Key not set. You'll get "API Key is not set. Please use the 'Comflowy Set API Key' node first." Run that node once and delete it.
• Network. The README's headline failure mode - calls to app.comflowy.com failing - is your connection, especially from regions with restricted access to US-hosted APIs.
• Credits add up fast. At ~600 credits an image, four images is 2400 credits in one go. Set num_images to 1 while you iterate on the prompt.
• Silent failure. On API errors the node returns a blank-ish image tensor instead of crashing, so the real error lives in your console. Read it before you assume the prompt was bad and burn another 600 credits on the same mistake.

Honest positioning: if you're comparing this to running Flux locally - there's no comparison to make, they're different tools. Local Flux dev at 1024² is free but mid-resolution; Ultra is where you go when the deliverable has to be big and clean and you're willing to pay per shot. For a one-off hero image it's the most direct path this pack offers to that tier of output.