FLUX 3
Black Forest Labs' flagship video model. FLUX 3 generates 5-20 second clips with synchronized audio from a plain-language prompt — the model interprets and expands your description before generation, so director-level results don't require director-level prompting. Output at 720p or 1080p in eight aspect ratios from 21:9 ultrawide to 9:16 vertical.
Duration
Duration of the video in seconds (5-20). Billed per second.
Resolution
Output resolution.
Aspect Ratio
Aspect ratio of the generated video. 'auto' lets the model choose from your prompt and inputs.
Audio
Generate synchronized audio (ambient sound, speech, effects). Off for a silent clip.
Moderation
Moderation strictness, 0 (strictest) to 4 (most permissive). Runs with image inputs are capped at 2 by the model.
Your result renders here.
Use FLUX 3 via the API
Generate with FLUX 3 from your own code. Async by design: submit a generation, get a run id back instantly, poll until it completes. Billed in credits at the best available provider price — from $0.17 per second.
1 — Start a generation
curl -X POST https://app.scenetra.com/api/v1/generate/flux-3-t2v \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"prompt":"A red fox trots through fresh snow at dawn, low sun behind the trees, slow tracking shot, soft wind and crunching snow","duration":"5","resolution":"720p"}'Response (202)
{
"runId": "run_abc123",
"status": "PENDING",
"model": "flux-3-t2v",
"estimatedCredits": 850,
"statusUrl": "/api/v1/runs/run_abc123"
}2 — Poll until COMPLETED (every 2-5 seconds)
curl https://app.scenetra.com/api/v1/runs/run_abc123 \
-H "Authorization: Bearer YOUR_API_KEY"Response
{
"runId": "run_abc123",
"status": "COMPLETED",
"progress": { "completed": 1, "total": 1 },
"outputs": [
{ "type": "video", "url": "https://images.scenetra.com/..." }
],
"error": null,
"estimatedCredits": 850
}Request fields
| Field | Type | Description | Default |
|---|---|---|---|
| prompt* | string | Describe the scene, action, camera movement, and any audio you want. Plain language works; the prompt is interpreted, not matched. | — |
| duration | string | Duration of the video in seconds (5-20). Billed per second.5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 · 14 · 15 · 16 · 17 · 18 · 19 · 20 | 5 |
| resolution | string | Output resolution.720p · 1080p | 720p |
| aspect_ratio | string | Aspect ratio of the generated video. 'auto' lets the model choose from your prompt and inputs.auto · 21:9 · 2:1 · 16:9 · 4:3 · 1:1 · 3:4 · 9:16 | auto |
| generate_audio | string | Generate synchronized audio (ambient sound, speech, effects). Off for a silent clip.false · true | true |
| safety_tolerance | string | Moderation strictness, 0 (strictest) to 4 (most permissive). Runs with image inputs are capped at 2 by the model.0 · 1 · 2 · 3 · 4 | 4 |
| callbackUrl | string (https URL) | Optional. When the run finishes (completed or failed), we POST the final run status to this URL — same shape as the poll response, plus model, params, and chargedCredits. Best-effort; polling remains the source of truth. | |
Unknown fields are rejected with a helpful 400. Media fields take https URLs. There is no provider parameter — every run is routed to the cheapest capable provider automatically.
Good to know
Billing
Runs bill your account credits at provider cost with 0% markup. The submit response includes the credit estimate; failed generations are refunded automatically. Add ?dryRun=1 to get the estimate without running anything.
Errors
Errors are always { "error": { "code", "message" } } with stable codes: unauthorized, model_not_available, invalid_parameter, insufficient_credits, rate_limited. A failed run is not an HTTP error — poll responses report status: "FAILED" with the reason.
What makes FLUX 3 different
Black Forest Labs' first video model
FLUX made Black Forest Labs the reference point for open-quality image generation, and FLUX 3 brings that pedigree to video. From one text prompt it generates a complete clip — picture and synchronized audio together — at 720p or 1080p. The prompt is interpreted and expanded by the model before generation, so a plain sentence about the scene, the action, and the camera is enough.
Up to 20 seconds in one generation
Duration runs from 5 to 20 seconds in one-second steps — one of the longest single-shot ranges of any current video model. Twenty seconds is enough for a full scene beat rather than a loop, and because billing is per second of output ($0.17/s at 720p, $0.29/s at 1080p), you pay exactly for the length you pick.
Synchronized audio at no extra charge
FLUX 3 generates ambient sound, speech, and effects matched to what happens on screen, and the audio toggle doesn't change the price — a 5-second 720p clip is $0.85 with or without sound. Several rival models bill audio as a surcharge rung; here it's simply part of the output. Turn it off if you want a silent clip for your own soundtrack.
Draft on FLUX 3 Draft, finish on FLUX 3
The companion FLUX 3 Draft model renders 720p previews at $0.06 per second — roughly a third of the standard rate. A practical Scenetra workflow: iterate prompts on a Draft node until the shot works, then run the winning prompt through FLUX 3 at 720p or 1080p for the final. Both models sit on the same board, billed at provider cost with 0% markup.
Parameters
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt* | text | Describe the scene, action, camera movement, and any audio you want. Plain language works — the prompt is interpreted and expanded before generation. | — |
| Duration | select | Duration of the video in seconds (5-20).5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 · 14 · 15 · 16 · 17 · 18 · 19 · 20 | 5 |
| Resolution | select | Output resolution.720p · 1080p | 720p |
| Aspect Ratio | select | Aspect ratio of the generated video. Auto lets the model choose from your prompt and inputs.Auto · 21:9 · 2:1 · 16:9 · 4:3 · 1:1 · 3:4 · 9:16 | auto |
| Generate Audio | select | Generate synchronized audio (ambient sound, speech, effects). Off for a silent clip.false · true | true |
| Safety Tolerance | select | Moderation strictness, 0 (strictest) to 4 (most permissive). Runs with image inputs are capped at 2 by the model.0 · 1 · 2 · 3 · 4 | 4 |
Pricing
From $0.17 per second
Pay per generation — only pay for what you use.
720p
$0.17/s
per second
1080p
$0.29/s
per second
Audio
included
per second
What a video costs
| Duration | 720p | 1080p |
|---|---|---|
| 5 seconds | $0.85 | $1.45 |
| 10 seconds | $1.70 | $2.90 |
Use cases
Film & previz
- Full 20-second scene beats
- Ultrawide 21:9 establishing shots
- Dialogue and ambience previz
- Camera-move studies from text
Advertising
- Sound-on product spots
- Concept commercials from a brief
- 1080p hero footage
- Aspect-ratio variants per placement
Social content
- 9:16 vertical clips with audio
- Narrated explainer snippets
- Atmospheric mood loops
- Story-length 15-20s posts
Music & mood
- Visualizer footage
- Ambient scene generation
- Lyric-video backdrops
- Silent clips for custom scores
Frequently asked questions
What is FLUX 3?+
FLUX 3 is Black Forest Labs' video generation model — the video sibling of the FLUX image family. It generates 5-20 second clips with synchronized audio from a text prompt, at 720p or 1080p, in eight aspect ratios including 21:9 ultrawide and 9:16 vertical. On Scenetra it runs as a node in the visual workflow editor.
How much does FLUX 3 cost?+
$0.17 per second at 720p and $0.29 per second at 1080p, billed on output duration. A 5-second 720p clip is $0.85; a 10-second 1080p clip is $2.90. Audio is included in those rates, not billed separately. Scenetra sells every model at provider cost with 0% markup.
Does FLUX 3 generate audio?+
Yes — synchronized ambient sound, speech, and effects are generated with the video, and turning audio on doesn't change the price. There's also a toggle to generate a silent clip if you plan to add your own soundtrack.
How long can a FLUX 3 video be?+
Anywhere from 5 to 20 seconds, selectable in one-second steps. That 20-second ceiling is unusually long for a single generation — most video models top out at 10-12 seconds — and since billing is per second, a longer clip simply costs proportionally more.
What is FLUX 3 Draft and when should I use it?+
FLUX 3 Draft is the fast, low-cost tier of the same model: 720p only, at $0.06 per second — about a third of the standard 720p rate. Use it to iterate on prompts and motion cheaply, then re-run the final prompt on FLUX 3 for full quality. Both are available as separate nodes on a Scenetra board.
Can I try FLUX 3 free online?+
FLUX 3 is a paid model. On Scenetra it's pay-per-generation from your credit balance, with no subscription gate: a 5-second draft costs $0.30 and a 5-second standard 720p clip $0.85.
How should I prompt FLUX 3?+
Write plainly: describe the scene, the action, the camera movement, and any sound you want to hear. FLUX 3 interprets and expands the prompt before generation, so you don't need keyword-stuffed prompt engineering. On a Scenetra board it's cheap to iterate — test variations on FLUX 3 Draft, then promote the best prompt to the standard model.
Related models
FLUX 3 Draft
The rapid-iteration tier of Black Forest Labs' FLUX 3 video model. FLUX 3 Draft generates 720p text-to-video previews at $0.06 per second — about a third of the standard FLUX 3 rate — with the same 5-20 second durations, synchronized audio, and eight aspect ratios. Iterate cheaply, then re-run the winning prompt on FLUX 3 for the full-quality final.
View model →Kling 3.0 Pro
Kuaishou's flagship video generation model delivering stunning visual fidelity. Kling 3.0 Pro supports text-to-video, image-to-video with start/end frames, element references for character consistency, and native audio generation.
View model →Seedance 2.5
ByteDance's Seedance 2.5 generates cinematic videos up to 30 seconds from text prompts with synchronized audio — voice, sound effects, and background music — built in by default. The newest Seedance generation, with mp4 or high-fidelity mov output for multi-round editing pipelines.
View model →Wan 3.0
Alibaba's Wan 3.0 generates up to 30 seconds of video in a single take, with native synchronized audio — dialogue, sound effects, and music — produced in the same pass as the picture. Pick any duration from 2 to 30 seconds, output at 480p, 720p, or 1080p, and choose from five aspect ratios or let the model frame the shot automatically.
View model →Start creating with FLUX 3
Use FLUX 3 alongside 50+ other AI models in Scenetra's visual workflow editor. No setup required.
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