NS WaveSpeed VEO 3.1 Fast Text to Video

Every API video node family eventually gets a Fast variant, and the logic is always the same: you don't want to pay full freight for the take you're going to throw away. NSWaveSpeedVeo31FastTextToVideo from symbiotica-ai/comfyui-nodes is WaveSpeed's cheaper, quicker Veo 3.1 tier - same model family, same inputs, less money and less waiting per render, with the tradeoff that the clips aren't quite the finished-grade quality of the standard node.

How it works

It's a straight text-to-video call to WaveSpeed (/api/v3/google/veo3.1/text-to-video on the fast tier). Prompt in, video_url string out. Everything you'd expect from the family is here: aspect_ratio (16:9 / 9:16), duration (4/6/8s), resolution (720p/1080p), negative_prompt, seed (default -1 = random), and generate_audio for Veo's native synchronized sound. enable_sync_mode defaults off - submit, poll every second, block until done, Cancel works because the poll checks ComfyUI's interrupt flag.

The one thing to wrap your head around: Fast isn't "Veo with a quality slider at 80%" that you ship. It's the node you run ten times while you're finding the prompt, and the standard node you run once when the prompt is right. On a metered API, that's the difference between an expensive exploratory session and a cheap one. The Fast tooltip even nudges you on the image-to-video side to feed bright, high-contrast stills - the tier rewards clean inputs.

The inputs that matter

• prompt - the scene and its audio.
• aspect_ratio - 16:9 or 9:16.
• duration / resolution - 4/6/8s, 720p/1080p.
• generate_audio - native audio on or off.
• client - the WAVESPEED_AI_API_CLIENT socket from the NS WaveSpeed Client node.

Output: video_url (STRING) - browser-preview it or feed a download-from-URL node.

Install and keys

# ComfyUI Manager: search "Symbiotica", or:
cd ComfyUI/custom_nodes
git clone https://github.com/symbiotica-ai/comfyui-nodes.git symbiotica
pip install -r symbiotica/requirements.txt

Restart, add the NS WaveSpeed Client node with your wavespeed.ai key (widget, Settings → Symbiotica, or WAVESPEED_API_KEY), wire client in. No model downloads.

Common issues

Fast is a trap only if you forget what it's for. The standard tier exists for a reason. If you keep the Fast node in the graph for the final render out of muscle memory, you'll ship a clip that's a notch below what you paid for. Same caution applies the other way: iterating on the full-price node is how a storyboard session becomes a surprise bill (external-api-nodes.md).

"API_KEY is empty." The NS WaveSpeed Client node isn't wired in - the key lives there, not on this node.