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FLUX 3 — One Multimodal Model for Video, Image and Audio
FLUX 3 is Black Forest Labs' multimodal foundation model, trained jointly on images, video, and audio in a single architecture. FLUX 3 writes video and sound together — up to 20 seconds in one generation — and follows keyframes, reference clips, and multilingual dialogue.
Coming soon — the API for this model is not available yet.
What you can build with this model
Real-world workflows and production use cases you can build and ship with this model.
Direct FLUX 3 with more than a prompt
Text is the starting point, not the whole instruction set. Hand FLUX 3 a first frame to animate, reference images that pin down a character, a source clip whose elements should carry into a new scene, or two keyframes that define where a transition begins and ends. FLUX 3 can also continue an existing video and its audio, so a shot can be extended instead of regenerated from scratch.
Read the FLUX 3 docs
Localize a campaign without reshooting it
FLUX 3 handles multilingual dialogue and renders readable text inside the frame, so one creative direction can travel between markets. Signage, titles and animated typography are generated as part of the scene rather than composited on afterwards, and the spoken track is produced with the picture — which is where FLUX 3 is already strongest, according to Black Forest Labs' own early evaluations of facial expression and multilingual work.
Take a product from still to motion
The same FLUX 3 backbone synthesizes and edits images across styles, aspect ratios and resolutions, then extends those stills into motion. Shape, colour, material and branding stay recognisable between the packshot and the clip, because both come out of one model instead of a still generator bolted to a separate video generator.
Why reAPI
One foundation, not three stitched together
FLUX 3 learns from images, video and audio inside a unified architecture built on Self-Flow, Black Forest Labs' approach to aligning multimodal generation and understanding. The modalities constrain each other: the sound has to match the impact, the motion has to obey the mass.
Sound generated with the picture
Every FLUX 3 video output carries native audio from the same generation — dialogue, ambience and impacts land on the frame they belong to, instead of being timed back onto silent footage in post.
Clips that chain into sequences
FLUX 3 chains individual generations into multi-shot sequences that run for minutes, with visual references holding characters and locations steady from scene to scene. Twenty seconds is the ceiling for one generation, not for the finished piece.
FLUX 3 vs Seedance 2.0
Black Forest Labs' own early evaluations put these two closest together of everything it compared — viewers preferred FLUX 3 in 52% of matchups, effectively a coin flip. The split is availability and scope: Seedance 2.0 is callable on reAPI right now, while FLUX 3 is a broader multimodal foundation still in phased rollout.
Capability
FLUX 3
Seedance 2.0 on reAPI
Scope
One multimodal foundation across image, video, audio and action prediction.
Video generation with optional audio.
Clip length per generation
Up to 20 seconds with audio in a single pass.
4 to 15 seconds per request.
Input types
Prompt, starting frame, reference images, reference clip, reference audio, and keyframes for controlled transitions.
Prompt, images, first/last frame roles, reference video and reference audio.
Audio
Native audio on every video output, generated with the picture.
Audio generation is an explicit toggle per request.
Multi-shot continuity
Agentic chaining of clips into sequences lasting minutes, held together by visual references.
Return the last frame and feed it into the next request to continue a shot.
Availability
Early Access at Black Forest Labs; public API, model ids and pricing not yet announced.
Live on reAPI today, billed per second by resolution.
Comparison reflects publicly documented behavior at the time of writing. The 52% preference figure is from Black Forest Labs' own preliminary evaluation of 10-second 720p text-to-video clips with audio, on a model it describes as still in development; sample size and methodology were not published, and it is not an independent benchmark.
Get ready for FLUX 3 in three steps
- step 01
Create an API key
Sign up at reAPI and generate a key. One key, one balance, and the same request shape across every model on the platform.
Open - step 02
Read the FLUX 3 reference
The FLUX 3 page tracks what Black Forest Labs has actually published — capabilities, input types and rollout stage — and gets the endpoint, parameters and rates the moment they are confirmed.
Open - step 03
Ship on a live model today
Video models with native audio are already callable on reAPI. Build the integration against one of those now, and switching to FLUX 3 later is a model id and a parameter map.
Open
Frequently asked questions
Common questions about this model.
FLUX 3 is Black Forest Labs' multimodal foundation model. It jointly learns from images, video and audio within one architecture rather than treating them as separate systems, and BFL positions it as a step toward models that perceive, predict and act across physical and digital environments.
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