Free AI Video API: CogVideoX Flash (2026)

Every "free AI video API" landing page turns out to be a trial with a credit card requirement. This one is actually free: NovAI runs Zhipu AI's CogVideoX Flash at $0.00 per generation as our developer on-ramp.

What you get for free

• Text-to-video generation — prompt in, MP4 out, OpenAI-style async task API.
• No credit card, no subscription — just an account.
• Studio playground: generate up to 5 videos and 20 images per day directly in NovAI AI Studio, preview instantly.

What the free tier is for

• Validating prompt ideas before spending on premium models.
• Storyboarding and concept clips.
• Learning the async video-task API pattern (create → poll → download) that every paid video model uses.

Try it in the browser (60 seconds)

1. Open aiapi-pro.com/studio.html and sign in.
2. Pick the Video tab → model shows CogVideoX Flash · FREE.
3. Type a prompt, hit generate. Previews are watermarked; downloads unlock after any top-up (from $5).

The production upgrade path

What it costs when you outgrow the free tier

The free model is a smoke test. The moment a clip has to ship, you are choosing between paid video models, and the price difference between them is far larger than the difference between gateways:

Every row above is sourced on the per-minute cost page, and Veo 3.1 vs Seedance 2.5 vs Kling 3.0 breaks the same numbers down by use case.

If you want the polling loop rather than a single request:

import os, time, requests

BASE = "https://aiapi-pro.com/v1"
H = {"Authorization": f"Bearer {os.environ['NOVAI_API_KEY']}", "Content-Type": "application/json"}

job = requests.post(f"{BASE}/video/generations", headers=H, timeout=60, json={
    "model": "cogvideox-flash",
    "prompt": "a paper boat drifting in the rain, close up, 35mm",
}).json()

while True:
    s = requests.get(f"{BASE}/video/generations/{job['id']}", headers=H, timeout=30).json()
    if s.get("status") in ("succeeded", "failed"):
        break
    time.sleep(5)

Pricing a batch instead of a single clip? The batch cost calculator turns clips × seconds × retries into a dollar total across 13 models.

API shape (same as paid models)

# create task
curl -X POST https://aiapi-pro.com/v1/video/generations \
  -H "Authorization: Bearer YOUR_NOVAI_KEY" \
  -d '{"model":"cogvideox-flash","prompt":"a cat walking on neon streets"}'
# -> {"id":"task_...","status":"queued"}

# poll until complete, then download the MP4 url

When you're ready for production, the request body stays identical — only the model name changes.