ImagineArt 1.5

Sometimes you don't need a 9-billion-parameter masterpiece, you need a lot of images for almost nothing. ImagineArt 1.5 is Runware's own workhorse text-to-image model, and it's the node you reach for when you want to iterate fast on a budget. It's one of the simplest nodes in the whole pack - prompt in, IMAGE out, no model files, no VRAM math.

ImagineArt is Runware's in-house model family (the imagine.art consumer product runs on it), and in the ComfyUI pack it lives under Runware/Image/imagineart as a plain txt2img node. If you're prototyping composition, testing prompt phrasings, or generating a batch of concept thumbnails, this is the cheap lane.

How it works

The only required input is positivePrompt. Everything else is optional:

• width / height - default 1024². Set to your target aspect.
• numberResults - 1 to 20, each on a different seed. This is where the value lives: this model is cheap enough that rolling 8 variations of a prompt costs pocket change, and you pick the winner instead of re-running.
• safety.checkContent - opt into the moderation pass; results show as NSFW: yes/no in the node's title bar.
• outputFormat / outputQuality - JPG/PNG/WEBP and compression level. Leave alone unless you have a reason.

The output is a native IMAGE, so it wires straight into Preview Image or Save Image. The request runs on Runware's cloud via the runware-sdk and comes back decoded into the same tensor type ComfyUI expects - you never touch a URL or a file path.

There's no seed widget on this node (that's a 2.0 thing), so don't go hunting for reproducibility knobs. Same for negative prompts and CFG - this is a "point it and shoot" node, not a fine-control one.

Installing it

It's part of the official Runware pack:

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

Restart, then add your key at ComfyUI Settings → Runware API key or via the RUNWARE_API_KEY environment variable. Dependencies are light - runware-sdk, pillow, soundfile - and there's nothing to download at install time.

Where people get burned

The trap is forgetting this is a paid API and treating it like your local SD install. It's cheap - the community's consensus is Runware's pricing is about the most transparent and bargain-basement around - but it's still metered, and a 20-result batch is still 20 charges. The other gotcha is expectations: 1.5 is a fast, economical model, not the flagship. When a prompt deserves the better engine, that's what the Pro tier and 2.0 are for. No API key set means instant errors, which is the pack's most common failure mode by far.