GPT IMAGE 2.6Explore new image model
API Stock
/VIDEO/flux-3-video
Video
Black Forest Labs

FLUX 3 Video API

Black Forest Labs' multimodal video model with native synchronized audio. Text-to-video, keyframes (1-10 images) and continuation of an existing clip, 5-20 seconds at 720p/1080p, with a low-cost draft mode.

  • Text to video
  • Image to video
Try modelGet API KeyDocumentation

Starting at

$0.06

per second of output

8 parameters · 6 price options

FLUX 3 Video playground

Input

Scene description: subject, action, camera movement, dialogue and sound

Keyframes for image-to-video, in playback order. One image is the start frame, two are start + end, three or more are spread evenly across the clip

Source video (mp4) to continue. Continuation is billed at a higher per-second rate and cannot be combined with imageUrls

Sign in to run

Runs are charged to your balance.

Output

Output will appear here.

Check the price and run the model. Your result will appear here; browser use does not need an API key.

FLUX 3 Video API pricing

OptionPrice per second
Draft: yes · Mode: generate · Resolution: 720p$0.06
Draft: yes · Mode: extend · Resolution: 720p$0.12
Draft: no · Mode: generate · Resolution: 720p$0.17
Draft: no · Mode: generate · Resolution: 1080p$0.29
Draft: no · Mode: extend · Resolution: 720p$0.41
Draft: no · Mode: extend · Resolution: 1080p$0.53

Quick start

Full API reference →
1curl -X POST https://api.api-stock.com/api/v1/generation/create \
2  -H "Authorization: Bearer $API_STOCK_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{
5    "model": "flux-3-video",
6    "input": {
7      "prompt": "A cinematic shot of a city at dusk",
8      "resolution": "720p",
9      "duration": 5,
10      "aspectRatio": "auto",
11      "draft": false,
12      "safetyTolerance": 2
13    }
14  }'

Parameters

NameTypeRequiredDefaultDescription
promptstringYes—Scene description: subject, action, camera movement, dialogue and sound
resolutionstringNo720pVideo resolution (affects pricing). Draft mode supports 720p onlyOne of: 720p, 1080p
durationnumberNo5Video duration in seconds (5-20). Billed per second
aspectRatiostringNoautoVideo aspect ratio. `auto` lets the model choose from the prompt and input framesOne of: auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16
imageUrlsstring[]No—Keyframes for image-to-video, in playback order. One image is the start frame, two are start + end, three or more are spread evenly across the clip
videoUrlstringNo—Source video (mp4) to continue. Continuation is billed at a higher per-second rate and cannot be combined with imageUrls
draftbooleanNofalseDraft mode: a fast, low-quality 720p preview at about a third of the price
safetyTolerancenumberNo2Moderation tolerance from 0 (strictest) to 4 (most permissive)

Frequently asked questions

How much does FLUX 3 Video cost?

FLUX 3 Video starts at $0.06 per second of output on API Stock. The final charge depends on the selected settings.

When was FLUX 3 Video released?

FLUX 3 Video was released on July 23, 2026 and is available through API Stock.

How do I get an API key for FLUX 3 Video?

Create an account and API key on API Stock, then fund your balance. The same key works with FLUX 3 Video and other catalog models.

How do I call the FLUX 3 Video API?

POST to https://api.api-stock.com/api/v1/generation/create with your API key and model "flux-3-video". Use the returned task id for polling or receive a webhook.

What input parameters does FLUX 3 Video accept?

FLUX 3 Video accepts 8 input parameters, including the required field(s) prompt. See their types, defaults and allowed values above.

What happens if a FLUX 3 Video request fails?

API Stock automatically retries the request on a reserve provider. If every provider fails, the charge is refunded to your balance.

Can I use FLUX 3 Video with the same API key as other models?

Yes. Use your API Stock API key and balance for FLUX 3 Video and other catalog models.

Other Video models

Guides