KlingAI 2.5 Turbo Pro

The "Turbo" in the name is the whole pitch. Kling 2.5 Turbo Pro is the fast lane of the Kling lineup on Runware - you trade some of the flagship's fidelity for markedly quicker renders and a lighter credit bill, and you get a node whose only required input is a prompt. For anyone whose bottleneck is "I need to see the motion before I commit to it," this is the node that turns video iteration into a loop instead of an event.

Why you'd reach for it

Because a slow loop is a broken workflow. The classic cloud-video frustration is paying flagship prices and waiting out long queues just to discover the motion was wrong. Turbo exists to make that cheap and quick: you explore the motion space, find the take that works, then (if you need the polish) re-render the keeper on a full-quality node. There's an argument that Turbo's output is good enough to be the final render for a lot of use cases anyway - social clips, storyboards, rough cuts.

How it works

Generated Runware node with the pack's shared base class: your positivePrompt (and optional frameImages, base64'd to PNG data URIs) rides to the Runware REST API over the runware SDK, and the finished clip is downloaded and wrapped as a native ComfyUI VIDEO object. Cost and NSFW flag print on the node title bar. The speed lives on Runware's side - your machine is just the remote control.

Inputs that matter

• positivePrompt - required. Text-to-video by default; add frameImages for image-to-video.
• frameImages (IMAGE) - optional first frame.
• duration - 5 or 10 seconds. Frames = duration × fps, and faster rendering makes 10s feel reasonable.
• width / height - 1024×1024 default.
• CFGScale - 0.5 default; negativePrompt ignored below guidance ~1.
• numberResults (1–4) - with Turbo pricing, rolling a few variations is actually affordable.
• outputFormat (MP4/WEBM/MOV), outputQuality (95).

Output: one video socket (VIDEO type).

Install and the API key

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

Restart ComfyUI (or Runware via ComfyUI Manager). Key from the Runware dashboard → Settings → Runware API key, RUNWARE_API_KEY, or runware auth login.

Gotchas

• No key → the pack's one-line "No Runware API key" error; RUNWARE_DEBUG=1 for full tracebacks.
• frameImages is an IMAGE tensor from Load Image, not a path.
• Turbo is a fidelity trade, not a free lunch. If the model's motion coherence at 720p-class resolution isn't holding up for your shot, that's the trade showing - promote the final to a higher tier.
• Closed weights, per-run pricing, cost on the title bar - same as every Kling node.

2.5 Turbo Pro is the node you'll actually use daily because it makes the feedback loop fast enough to be fun. Speed as a feature isn't marketing here; it's the difference between guessing and iterating.