Flux 3
Run Flux 3 on your iPhone.
Flux 3 is Black Forest Labs' video model, with native audio and clip lengths up to 15 seconds. King AI runs it alongside 360+ other models, so you can put the same prompt through Flux 3, Veo 3.1 and Kling V3 Pro and keep whichever wins.
Specs
What Flux 3 actually does.
Read from the app's live model catalog, so these numbers match what you get.
| Model | Max resolution | Clip length | Audio | Credits per second | Shortest clip |
|---|---|---|---|---|---|
| Flux 3 | 720p | 5s·10s·15s | Yes | 1.7 (~$0.68) | 5s · 8.5 credits (~$3.40) |
| Flux 3 1080p | 1080p | 5s·10s·15s | Yes | 2.72 (~$1.09) | 5s · 13.6 credits (~$5.44) |
| Veo 3.1 | 1080p | 4s·6s·8s | Yes | 4 (~$1.60) | 4s · 16 credits (~$6.40) |
| Kling V3 Pro | 1080p | 5s·10s·15s | Yes | 1.68 (~$0.67) | 5s · 8.4 credits (~$3.36) |
| Seedance 2.0 | 1080p | 5s·10s·15s | Yes | 6.8 (~$2.72) | 5s · 34 credits (~$13.60) |
Where it works
Five ways to generate with Flux 3.
Flux 3 is wired into every video mode King AI offers, not just text to video.
Text to video
Describe a shot and Flux 3 renders it with matching audio.
Image to video
Start from a still and let Flux 3 animate it.
First & last frame
Give it an opening and closing image; Flux 3 fills the motion between them.
Keyframes
Steer a longer sequence with reference frames along the way.
Extend
Continue an existing clip without a visible cut.
Comparison
When to reach for Flux 3.
Flux 3 sits in the affordable tier: cheaper per second than Veo 3.1 or Seedance 2.0, and it supports clips up to 15 seconds where Veo 3.1 caps at 8. If you want the longest single take for the fewest credits, start here. If you need maximum fidelity on a hero shot, Veo 3.1 4K is the better spend.
The practical workflow is to run both. King AI can generate several models on one prompt at the same time, so you compare real output instead of guessing from a spec sheet.
FAQ
Flux 3, answered.
What is Flux 3?
Flux 3 is Black Forest Labs' video generation model. King AI supports it for text to video, image to video, first-and-last-frame transitions, keyframe control, and extending an existing clip. It generates native audio alongside the picture.
Can I use Flux 3 on iPhone?
Yes. Flux 3 runs inside King AI on iPhone, iPad, Mac, and the web. Download King AI free from the App Store, pick Flux 3 in the model list, and generate. There is no separate Flux subscription and no waitlist.
What resolution and length does Flux 3 support?
Flux 3 outputs 720p and Flux 3 1080p outputs 1080p. Both support clip lengths of 5s·10s·15s. Both generate audio.
How much does a Flux 3 video cost?
King AI bills per second: Flux 3 costs 1.7 credits per second (~$0.68) and the 1080p variant 2.72 credits per second (~$1.09). The shortest Flux 3 clip is 5 seconds, so it costs 8.5 credits (~$3.40) at 720p and 13.6 credits (~$5.44) at 1080p. A five-second Flux 3 1080p run needs credits from a plan or credit pack.
Is Flux 3 better than Flux 2?
They do different jobs. This page is about Flux 3 video; Flux 2 Max is an image model. Flux 3 also has image tiers of its own in King AI, billed per image. King AI includes both families, so you can generate a Flux 2 Max image and animate it with Flux 3 in the same session.
Does King AI have an official partnership with Black Forest Labs?
No. King AI supports Flux 3 the same way it supports every other model in the catalog. Flux is a trademark of Black Forest Labs and King AI is an independent app.
Get started
Generate your first Flux 3 clip today.
A five-second Flux 3 1080p run needs credits from a plan or credit pack.