FLUX 3 Video Prompts — 8 Tested Recipes With Outputs

per generated second for 5–20 s HD or FHD clips — one OpenAI-compatible endpoint at https://api.apimart.ai/v1, no monthly plan required. (observed 2026-10-12)

Get an API key · Live pricing · Model page · ⚡ 60-second quickstart

Why teams call FLUX 3 Video (flux-3-video) through APIMart

• One key, entire catalog. The same https://api.apimart.ai/v1 base URL and Authorization header reach FLUX 3 Video (flux-3-video) and 300+ other image, video and language models — switch the model field, not your client.
• Per-second billing. A job is charged for the seconds it actually generates at the resolution you picked.
• The charge comes back in the response. Every completed task reports the amount billed (cost / credits_cost); a task marked failed is refunded.
• Async by design. Submit, take the task_id, poll GET /v1/tasks/{id} — batching and retries are ordinary queue work, not a bespoke integration.

FLUX 3 Video covers text-to-video, ordered keyframes, video continuation and synced audio in 5–20 s HD or FHD clips.

Model id and routes

Route	model value	Billing	Notes
Text-to-video / image-to-video	flux-3-video	per generated second, by resolution	see the model page for the exact tiers

Endpoint: POST https://api.apimart.ai/v1/videos/generations (OpenAI-compatible), then poll GET /v1/tasks/{task_id}.

Pricing

Resolution	List price	Effective price
per generated second	—	see the live pricing page

Prices are a snapshot; the pricing page and data/model.json are refreshed by CI, and a completed task reports the exact amount in its cost field.

Request parameters

Field	Type	Default	Notes
model	string	required	the model id shown in the route table above
prompt	string	required	the shot description; camera and subject motion belong here
duration	integer	route default	clip length in seconds — billing is per generated second
resolution	string	route default	480P / 720P / 1080P or the route’s own tiers
size / aspect_ratio	string	16:9	output framing
image_urls	string[]	—	first frame, first + last frame, or style references, where supported
seed	integer	—	fix the seed to reproduce a take

The table lists the fields accepted by the APIMart OpenAI-compatible video endpoint. Check the model page for anything this model adds on top.

Quickstart

curl --request POST --url https://api.apimart.ai/v1/videos/generations \
  --header "Authorization: Bearer $APIMART_API_KEY" --header 'Content-Type: application/json' \
  -d '{"model":"flux-3-video","prompt":"A bamboo forest at sunrise, slow push-in","duration":5,"resolution":"720P","size":"16:9"}'

import os, time, requests

BASE = "https://api.apimart.ai/v1"
HEADERS = {"Authorization": f"Bearer {os.environ['APIMART_API_KEY']}", "Content-Type": "application/json"}

created = requests.post(f"{BASE}/videos/generations", headers=HEADERS, timeout=60, json={
    "model": "flux-3-video", "prompt": "A bamboo forest at sunrise, slow push-in",
}).json()
task_id = created["data"]["id"]

while True:
    task = requests.get(f"{BASE}/tasks/{task_id}", headers=HEADERS, timeout=60).json()["data"]
    if task["status"] in ("completed", "failed"):
        break
    time.sleep(5)
print(task.get("cost"), task["result"]["videos"][0]["url"])

Runnable versions: examples/. The task lifecycle is pending → processing → completed | failed.

FAQ

What is the FLUX 3 Video model id?

flux-3-video. See the route table above.

How is it billed?

per generated second for 5–20 s HD or FHD clips. The completed task reports the exact amount in its cost field; a failed task is refunded.

How do I get a key?

Use the Get an API key link — $1 minimum top-up, no plan required.

Attributed links (how this repository is measured)

Purpose	Attributed link	Target
Model page	https://go.apimart.ai/k-b63e6d	apimart.ai/zh/model/flux-3-video
Live pricing	https://go.apimart.ai/k-850221	apimart.ai/zh/pricing
Get an API key	https://go.apimart.ai/k-7c040e	apimart.ai/zh/keys

Outbound APIMart links are minted through the promo link API; hand-made tracking parameters are rejected by tools/check_links.py in CI.

Disclosure

FLUX 3 Video is a third-party model served through APIMart; this repository documents how to call it and publishes model ids and prices, and does not claim official status. Model names, prices and documentation belong to their respective owners.

License

MIT — see LICENSE.