Runway Aleph 2.0

Aleph is Runway's video-editing model, the one that does the VFX-adjacent jobs: swap a product into a shot, remove the rig or a piece of scaffolding, clean up a plate. It's the moving-image workhorse for advertising-style workflows, and this node runs it on Runware's cloud. You drop in a clip, describe the edit, and a new VIDEO comes back - no Runway account, no local diffusion, no frame-by-frame compositing.

The model itself doesn't ship weights. That's the whole pitch of Aleph and of this node: the capability lives on Runway's servers, and Runware resells access through the same one-node-per-model pack as everything else. If you've been hand-rotoscoping objects out of clips, this is a serious shortcut - with a per-run bill attached.

The inputs that matter

• video (required, STRING): the source clip, as a UUID or URL. The tooltip is explicit about the constraint that bites people: duration must be 2 to 30 seconds. Shorter than two seconds and the model refuses; longer and you need to cut first.
• positivePrompt (required, STRING, multiline): what to add or change. "Replace the cup with a chrome flask," "remove the crane from the background," "clean the puddle reflections." This is an edit instruction, not a gen prompt - write it like you're telling an editor what to fix.
• frameImages (optional, IMAGE): reference frames to guide the edit, for consistency on particular shots.
• numberResults (optional, default 1, max 4): how many variations to roll. Each uses a different seed, so this is your "show me options" knob.
• outputFormat (MP4 / WEBM / MOV) and outputQuality (default 95, range 20–99): the usual file knobs. Push quality up if you're re-encoding a final asset.

The safety/ttl block is standard pack fare: safety toggles the group on, with safety.checkContent and a safety.mode of none / fast / full. ttl (time-to-live, min 60s) only matters when you're asking for URL outputs.

How it works

Feed the clip up, the prompt rides along, and Runway's edit runs on Runware's GPUs. The result comes back and the pack wraps it as a native VIDEO object - wire it straight into a preview/save node or the ComfyUI video tooling. Same pack-wide mechanism as every Runware node: install once, add an API key, and each run shows its cost on the title bar.

Install and the gotchas

Install the pack via ComfyUI Manager (search Runware) or clone https://github.com/Runware/ComfyUI-Runware into custom_nodes and pip install -r requirements.txt. Restart, then set a key (Settings → Runware API key, RUNWARE_API_KEY, or runware auth login).

The two real failure modes: feeding a clip outside the 2–30s window, and expecting literal frame-level control. Aleph is a language-driven editor - it's brilliant at "replace X with Y," and it will happily reinterpret vague prompts. Keep the instruction concrete, keep the source clean, and remember you're paying per generation, so numberResults of 4 on a long clip is a spending decision, not a free roll of the dice.