FalAuraFlowAPI

FalAuraFlowAPI runs AuraFlow - fal's own 6.8B rectified-flow transformer - through the fal.ai API and returns an IMAGE. AuraFlow is the Apache 2.0 model fal backed with real compute in July 2024, one month after the SD3 license collapse got the whole family banned from CivitAI. Its v0.2 genuinely beat Flux Dev on prompt adherence for a moment. Then Flux landed, the ecosystem never materialized, and fal never shipped another version. By 2026 it survives mostly as a name and a ComfyUI sampler node that has nothing to do with it.

Which makes this node a small piece of history: the cloud-Flux pack's "also supported" model, tucked in because it was free to add. If you're here, it's probably curiosity or a specific commercial constraint, because Apache 2.0 means no license friction - you can use AuraFlow outputs commercially without asking anyone, which is not true of Flux Dev.

How it works

The node reads your fal key from the pack's keys folder, submits to fal-ai/aura-flow, and downloads the result. It's a one-image-per-call node - num_images is hardcoded to 1 in the source, so don't expect batching here. The expand_prompt boolean maps to AuraFlow's prompt-expansion option: with it on, the service rewrites your prompt internally, which helps weaker prompts but fights against precise ones. Keep it off if you care about exact adherence.

The inputs that matter

• prompt - multiline text. AuraFlow understands natural language reasonably well.
• steps - default 30, max 50. More steps cost more; 20-30 is the practical band.
• cfg - guidance scale, default 3.5. Unlike Flux's distilled tiers, AuraFlow is an un-distilled base model, so CFG actually behaves like a normal CFG dial.
• expand_prompt - off by default; flip on if your prompts are thin.
• seed and api_key - standard.

Single IMAGE output, straight into Save Image.

Install

Same pack, same drill:

cd ComfyUI/custom_nodes
git clone https://github.com/BetaDoggo/ComfyUI-Cloud-APIs

or Manager → search "ComfyUI-Cloud-APIs", restart, drop a fal key into ComfyUI-Cloud-APIs/keys/ and top up at fal.ai/dashboard/billing.

Troubleshooting

• "Application is not public" - the usual fal error when the account has no credit or the endpoint isn't available to you. Top up billing.
• Output looks generic / ignores your prompt - try expand_prompt on; AuraFlow v0.3 traded adherence for a slight aesthetic gain, so thin prompts can wander.
• Why does nobody talk about this model? Because the ecosystem never arrived - no trainers, no LoRAs, one ComfyUI node left behind. It's a perfectly fine generator that time passed. Treat it as the curiosity it is and don't build a production pipeline on it.

The pack is archived. This node, like the rest, is a thin HTTP wrapper that keeps working until fal retires the endpoint - which, given AuraFlow's status, is a real possibility. Don't get attached.