Kling 2.6 Text-to-Video

Kling 2.6 Text-to-Video is the previous-generation Kling text-to-video node, and that's its real selling point: it's cheaper and less demanding than the 3.0 line while still producing solid, prompt-faithful clips. If you're doing volume - storyboards, drafts, shot ideas you'll never use - starting here instead of on Kling 3.0 keeps the bill down. When a clip actually matters, re-run it on 3.0 or Pro.

The model split is simple: Kling 2.6 (the standard tier) and Kling 2.6 Pro. Pro is the one with the interesting extras - cfg_scale for prompt adherence and sound for joint audio-video co-generation. Sound defaults to on for Pro, and the tooltip is honest that it doubles the cost. That's the biggest footgun in this node: if you don't want audio, turn it off or you're paying twice for every clip.

How it works

Same pattern as the rest of the pack's video nodes: you give it a prompt, it submits the job to WaveSpeed, polls until the clip is ready, and returns a video_url STRING. Feed that into Preview Anything to watch or download. There's an aspect_ratio dropdown (16:9, 9:16, 1:1) and duration is a fixed choice of 5 or 10 seconds - not a free range.

The inputs that matter

• prompt - describe scene, motion, and audio (Pro can generate sound, so prompt it like a filmmaker: "waves crashing, distant seagulls").
• model - Kling 2.6 or Kling 2.6 Pro.
• negative_prompt - what to keep out of visuals and audio.
• aspect_ratio - 16:9, 9:16, or 1:1.
• duration - 5 or 10 seconds.
• cfg_scale - Pro only, 0–1; higher follows the prompt more closely.
• sound - Pro only, default on, doubles cost.

The seed widget deserves attention: the tooltip is explicit that this endpoint has no seed parameter. It's cache control only - randomize re-runs a fresh, re-billed generation each queue pass; a fixed value lets ComfyUI reuse the cached video without calling the API.

Installing it

Part of the ERPK Collection (eRepublik-Labs/comfyui-nodes-erpk). ComfyUI Manager: search erpk → ERPK Custom Nodes → restart. Or:

cd ComfyUI/custom_nodes
git clone https://github.com/eRepublik-Labs/comfyui-nodes-erpk.git erpk
cd erpk
pip install -r requirements.txt

WaveSpeed API key required (Settings → ERPK → API Keys). No model downloads.

Common issues

• Audio you didn't ask for - Pro defaults sound to on. Turn it off unless you want it; it doubles the per-clip price.
• cfg_scale does nothing on standard - it's Pro-only. If you're on Kling 2.6, that input is inert.
• Duration surprises - it's a 5-or-10 dropdown, not a slider. There's no 7-second clip here.
• Seed isn't a seed - don't expect repeatability from a fixed seed; the API has no seed param. A fixed value only helps ComfyUI's cache.