PixVerse V5 Fast

PixVerse V5 Fast is the iteration node: the stripped-down, cheaper, quicker version of the V5 family, built for the part of video work nobody talks about - the first five drafts that are all wrong. You type a prompt, get a video back fast, decide it's not it, change a word, go again. That loop is brutal on a premium per-run model and fine on V5 Fast, which trades away the bells and whistles (no style presets, no effect templates, no thinking mode) for speed and a smaller bill.

The shape is familiar PixVerse: prompt in, optional starting frame, VIDEO out. What's missing from the dropdowns tells you what this node is for - it's not for hero shots or stylized loops, it's for finding the motion, the timing, the framing that works, so that when you're ready to commit, you spend the real money on the full V5.

What you actually set

• positivePrompt - required. Keep it descriptive but don't over-scope; you're testing a concept.
• frameImages - IMAGE socket for image-to-video.
• size - resolution presets from 360p to 1080p, default 720p (16:9).
• duration - 5 or 8 seconds.
• negativePrompt, seed, numberResults - the usuals.

That's genuinely about it. No style, no effect, no camera controls. Output is one video socket, type VIDEO.

Install

One-time pack install: ComfyUI Manager → search Runware → install → restart, or

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

API key into ComfyUI Settings → Runware API key or RUNWARE_API_KEY. Light dependencies, no model downloads.

Where people get burned

• "Fast" is relative, not absolute. It's cheaper and quicker than full V5, but it's still a cloud video generation - a handful of seconds of render plus queue time. Don't expect instant.
• Quality is visibly a notch down. That's the trade you're making on purpose. If you find yourself taking V5 Fast outputs to production, you're using the wrong node.
• safety.mode defaults to none. Same opt-in story as the other video nodes in the pack.

The honest take: V5 Fast is the node you reach for when you're doing the work - testing, iterating, blocking out a sequence - and V5 is the node you reach for when you're done thinking. Most video workflows need both; this one is the one that keeps your balance from bleeding out on drafts.