Kling VIDEO 3.0 Pro

If you've only got budget for one Kling node, this is probably it. Kling 3.0 Pro is the classic text-to-video and image-to-video workhorse - no reference-video rewriting, no omni gimmicks, just prompt in, video out, with the controls you actually recognize from local generation. It's the node that feels most like home to a ComfyUI user, except the render happens on Kuaishou's servers instead of your GPU.

The catch, and it's the same catch for everything in the Runware/ComfyUI-Runware pack: it's a closed API model. You pay per generation, and the node is honest about it - each run prints its cost. For one-off clips where waiting out a local render isn't an option, that's a fine trade.

How it works

The node is thin glue. Widgets become a request with model AIR klingai:kling-video@3-pro and task type videoInference, the runware-sdk sends it over REST, and when it's done the node downloads the MP4 and wraps it as a native VIDEO output you can drop into Preview Video or Save Video.

Where this one differs from the Omni line is the control surface:

• negativePrompt - present here, and it works the way you'd expect. Worth noting the tooltip's honest caveat: it's ignored when guidance is disabled (CFG ≤ 1), so don't lean on it if you're running guidance-free.
• width / height - plain pixel widgets, 1024 default, no size dropdown. Set these directly.
• duration - a straight 3–15 second slider, not the gated toggle the Omni models use.
• characterOrientation - a Kling-specific touch: tell it whether to take character orientation from the image or the video reference.
• sound + keepOriginalSound - native audio generation, or preserve audio from a reference.
• numberResults - 1–4 variations per queue.

You can also feed referenceImages and frameImages (IMAGE tensors) and referenceVideos to condition the generation, and video accepts a URL or UUID for prompt-based editing of an existing clip.

The outputs

One video socket, type VIDEO, straight into a preview or save node. On older ComfyUI builds it degrades to a saved file path string instead - the fix is upgrading ComfyUI, not the pack.

Installing it

This is a pack-level install, so you do it once for all the Kling, Luma, LTX, and Krea nodes:

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

Restart, then set your key via ComfyUI Settings → Runware API key, the RUNWARE_API_KEY env var, or runware auth login. Dependencies are light - the SDK, pillow, soundfile - and no model files download.

Where people get burned

The classic is pasting a local path into video when it wants a URL or UUID. And because this model lets you set width/height directly, don't send it something silly like 8K just because the widget accepts a number - you'll pay for it. If the run info line shows a cost that makes you wince, check numberResults. Otherwise, this is the Kling node that just works.