model guide
FLUX 3 Video: AI Video Model with Synced Audio
FLUX 3 Video guide with synced audio, HD and FHD output, 5-20 second durations, Kansova credit costs, prompts, and limitations.
TL;DR
A video model with built-in synchronized audio, flexible 5-20 second durations, and HD/FHD output, billed per second on Kansova.
Who this is for
- Creators who want dialogue, ambience, or music synced to the generated video.
- Marketing teams producing short ads that need sound without a separate audio pass.
- Designers who need flexible durations from 5 to 20 seconds in HD or FHD.
Best for / Not best for
Best for
- Video with synced audio
- Short ads with sound
- Flexible 5-20s durations
- Text-to-video and image-to-video
Not best for
- Ultra-low-cost silent drafts
- Long-form video
- Exact on-screen text
- 2K-and-above deliverables
Parameters
| Parameter | Supported value | Notes |
|---|---|---|
| Duration | 5-20 seconds | Any whole-second value, snapped to 5, 10, 15, or 20 in the studio. |
| Resolution | HD or FHD | FHD costs more per second; HD is the default in the canvas. |
| Aspect ratio | 16:9, 9:16, 4:3, 3:4, 1:1, 21:9, 2:1 | Wide range for different channels. |
| Audio | Synced audio included | Sound is generated with the video; describe it in the prompt. |
| Input | Text or reference image | First reference image acts as the starting frame. |
| Processing | Asynchronous | Kansova polls task status until completion. |
Pricing
Kansova bills generations in credits. Pro is $19/month for 750 credits; Studio is $39/month for 1,700 credits.
| Generation | Kansova credits | Cost methodology |
|---|---|---|
| 5-second HD clip | 60 credits | About $0.68 provider cost |
| 5-second FHD clip | 100 credits | About $1.16 provider cost |
| Per requested second | 12 credits HD / 20 credits FHD | About $0.14-0.23/sec provider cost |
Comparison
| Dimension | FLUX 3 Video | Sora 2 | Minimax H3 | Seedance 2.0 |
|---|---|---|---|---|
| Primary strength | Synced audio | Cinematic scenes | 2K resolution | Finished creative |
| Kansova access | Available | Available | Available | Available |
| Duration options | 5-20 seconds | 4-20 seconds | Up to 15 seconds | 5-15 seconds |
| Kansova cost | 12-20 credits/sec | 8 credits/sec | 11 credits/sec | 5-10 credits/sec |
| Best workflow | Ads with sound | Premium moments | 2K product shots | Campaign output |
Prompt examples
- 01
A street musician plays guitar on a rainy evening corner, ambient city sounds and distant traffic, warm bokeh lights. - 02
A chef cracks an egg into a sizzling pan, close-up with crisp cooking sounds, bright morning kitchen light. - 03
Ocean waves roll onto a quiet beach at sunrise, gentle surf audio, slow drone pull-back over the shoreline. - 04
A sneaker rotates on a pedestal while a deep bass beat pulses, studio lighting sweeps across the fabric texture. - 05
Rain patters on a cafe window as a barista steams milk, cozy interior sounds, soft cinematic depth of field.
Known limitations
- Highest per-second cost in FHD mode; use HD for drafts.
- Synced audio quality varies; review sound before shipping.
- Small text, logos, and fine typography may not render accurately.
- Queue time depends on upstream provider load.
Alternatives
Frequently asked questions
How many credits does FLUX 3 Video use?
Kansova charges 12 credits per second in HD and 20 credits per second in FHD, for durations from 5 to 20 seconds.
Does FLUX 3 Video include audio?
Yes. Synchronized audio is generated with the video; describe the sound you want in the prompt.
Can I animate a still image with FLUX 3 Video?
Yes. Attach a reference image and it is used as the starting frame for the clip.
Last updated
2026-08-07
Sources and methodology
Parameters were checked against the provider API material supplied to Kansova and the live Kansova controls on 2026-07-06. Reference API costs are planning figures from the supplied provider catalog, not a separate charge billed by Kansova.
- EvoLink API documentation index
Provider documentation used to verify Seedance modes and parameters.
- Kansova product facts
Canonical list of supported workflows and current limitations.
- Kansova pricing
Current subscription and monthly credit allowances.