FLUX 3 Max API

FLUX 3 Max (Oct 2026), Black Forest Labs' video model — 720p clips of 5–20 seconds with native audio, text-to-video and image-to-video. $0.0425/s is fal's promotional price until Nov 7, 2026 (then $0.17/s).

$0.0425/s on Varosity credits ($0.0425/s with your own key). Clips up to 20s with native audio.

Use FLUX 3 Max with your agent Try it in the browser

no falaccount needed · provider's list price, no markup · failed renders never billed

Best for

native audio
5–20s clips
promotional price until Nov 7

How to get the best result

Low-cost video with native audio: 720p clips of 5 to 20 seconds, from text or from a start frame. $0.0425/s is fal's promotional price until Nov 7, 2026 (then $0.17/s). Pick instead: grok-imagine-video for 1–15s audio clips; veo-3.1 for lip-sync talking heads; kling-3.0 for cinematic character work.

Prompting

Describe subject, action, setting and camera in one or two sentences; add the sounds you want heard.
For image-to-video describe the motion only; the clip keeps the start image's framing (aspectRatio is not sent).
Longer clips (10–20s) need a beginning, middle and end in the prompt.

Settings on Varosity

durationSec is whole seconds from 5 to 20, billed per second produced at $0.0425/s (promotional until Nov 7, 2026; the model pauses then until it is repriced).
720p on Credits; providerOptions.resolution 1080p only with your own fal key (while the model is available).
providerOptions.generateAudio (default true; false gives a silent clip). fal charges the same per second with or without audio.

Avoid

Asking for 20 seconds when 5 will do.
Relying on readable on-screen text.

Example prompt

A paper lantern drifts up through a night sky full of slowly falling snow, warm glow on the flakes. Soft wind, distant bells.

From fal.ai, checked against what Varosity sends.

Call it from your code

One Varosity key works for every model. Video renders are async — the response has a jobId; poll GET /api/v1/jobs/{jobId} until status is "succeeded", then read outputUrl.

curl -X POST https://varosity.ai/api/v1/video/generate \
  -H "Authorization: Bearer $VAROSITY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "cinematic aerial of a coastal road at golden hour, slow push-in",
    "modelId": "flux-3-max",
    "aspectRatio": "16:9",
    "durationSec": 5
  }'

Or ask your agent

Connect Claude, Cursor, or any MCP client to https://varosity.ai/api/mcp with your key, then say:

"Use Varosity with flux-3-max to make a 5-second clip of …"

Agent setup guide