Seedance 2.5 is ByteDance's long-take model, built to hold a single native shot for up to 30 seconds and lean hard on references.
Flux 3 is Black Forest Labs' first video model, a multimodal world model that pins keyframes, obeys real physics, and generates sound with every clip. Both run on Morphic, so here is how they compare, clip for clip, and how to pick between them.
Seedance 2.5 vs Flux 3: the specs
Each maker's own published numbers. A blank or "not published" cell means the maker hasn't stated that spec yet.
| Feature | Seedance 2.5 | Flux 3 |
|---|---|---|
| Maker | ByteDance | Black Forest Labs |
| Clip length | Up to 30s single-shot | 5 to 20s per pass, plus continuation |
| Resolution | Up to 1080p native | Up to 1080p native (2K, 4K announced) |
| Native audio | Native, 10+ languages | On by default, synced to the action |
| Reference inputs | Up to 50 (30 image, 10 video, 10 audio) | Keyframes today; image, video, audio references announced |
| Audio-only reference | A voice or music track can drive the shot | Not yet |
| Keyframe control | Through references | Up to 10 stills pinned to timestamps |
| Physics-true motion | Strong on realism and camera moves | Trained for weight, momentum, and collisions |
| Edit an existing clip | Region-level edit, source 4 to 30s | Announced, not yet shipped |
| Extend an existing clip | Forward, backward, or bridging two clips | Continuation from the last frame |
| Open weights | Closed model | Not yet (Flux 3 Dev announced) |
| On Morphic | Available now | Available now |
Sample clips, side by side
The same brief run through both models on Morphic, one category at a time, so you can judge the output rather than the spec sheet. Each clip carries its own audio, so unmute one to hear it. Both clips in a pair were generated at the same settings here, 16:9 at 720p, so you are weighing the models rather than the resolution.
Cinematic realism
Watch the moving camera over real terrain: whether parallax holds, light falls the right way, and fast foreground detail stays clean instead of smearing.
Seedance 2.5
Flux 3
Human performance
Watch the face at close range: skin and eyes reading as real, a micro-expression landing on cue, and features staying consistent as the head moves rather than drifting between frames.
Seedance 2.5
Flux 3
Physics and motion
Watch the collision: whether mass and momentum read right, shards scatter the way real ones would, and the impact sound lands on the frame it should.
Seedance 2.5
Flux 3
Product and commercial
Watch the close detail: honest material, straight lines that stay straight, and no warping on edges, logos, or reflections as the object turns.
Seedance 2.5
Flux 3
Which is better, Seedance 2.5 or Flux 3?
The two split along a few clear lines. Here is where each one pulls ahead; which of these matters is down to the work in front of you.
Where Seedance 2.5 leads
- Length in one take. Up to 30 seconds holds a full ad spot or a short scene in a single shot where a shorter clip has to cut, and an extend adds more to either end.
- Reference control. Up to 50 inputs, including an audio-only reference for pacing and lip-sync, keep character, set, and rhythm consistent across a sequence.
- Localization. Native support for 10+ languages covers captions, titles, and versioning a scene across markets.
Where Flux 3 leads
- Physics-true motion. Weight, momentum, and collisions follow real rules, so an impact, a splash, or a fall reads as filmed rather than floaty.
- Keyframe blocking. Up to ten stills pin to timestamps, and the model interpolates one continuous take through every mark.
- Event-synced audio. Native audio is on by default and follows what happens on screen, so an effect or a line lands in sync.
Run both models on Morphic
You do not have to pick once. Morphic is a complete AI video production workspace: multi-model generation on one roster, AI storyboarding on a shared Canvas, and a built-in timeline editor, with an agentic Copilot running the work between them.
- Compare on the Canvas. Run one brief through both models and line up the takes before spending another credit, exactly as the clips above were made.
- Finish in one place. Cut the winner on the timeline, balance audio per clip, and burn on styled subtitles, with no export step between.
Both Seedance 2.5 and Flux 3 are on the Morphic roster now, so you can run either, or both, without leaving the workspace.
FAQs
They are built around different strengths. Seedance 2.5 is ByteDance's long-take model: up to 30 seconds of native single-shot video, up to 50 multimodal references, and native audio in 10+ languages.
Flux 3 is Black Forest Labs' first video model, a multimodal world model that generates 5 to 20 second clips with physics-true motion, up to ten pinned keyframes, and synchronized audio on by default. Seedance 2.5 leads on length and reference control; Flux 3 leads on physical realism and keyframe blocking.
Seedance 2.5, by a clear margin: up to 30 seconds of native single-shot video, extendable further, against Flux 3's 5 to 20 seconds per pass.
Flux 3 can still block several angles in one generation and extend a clip with continuation, so a multi-shot sequence comes out in one run, but for a single 30-second take, Seedance 2.5 is built for it.
Flux 3 makes physical accuracy its headline: it was trained so weight, momentum, and collisions follow real rules, and its audio tracks the events on screen.
Seedance 2.5 is also strong on realism, with steady camera moves held across a long take and natural light behavior. For a shot that lives or dies on a believable impact, splash, or fall, Flux 3 has the edge; for a sustained realistic take, Seedance 2.5 holds well.
They control a shot in different ways. Seedance 2.5 takes up to 50 references (30 images, 10 video, 10 audio), including an audio-only track that can drive pacing and lip-sync, which suits locking a character and rhythm across a sequence.
Flux 3 pins up to ten stills to specific timestamps and interpolates one continuous shot through them, which suits choreographing a move. Combined image, video, and audio references for Flux 3 are announced but not shipped yet.
For ad spots, Seedance 2.5's 30-second single take covers a full commercial in one generation, with references to hold a look across it.
For product and material shots, Flux 3's physics training keeps reflections, weight, and surfaces honest as an object turns, and its native audio adds the right sound in the same pass.
The honest answer is to run the same brief through both on Morphic and compare, which is what the clips above show.
Yes. Both are on Morphic's roster now: pick a model in the prompt bar, write the shot as a brief, attach any references, and generate.
Because every take renders onto the Canvas, you can run the same brief through Seedance 2.5 and Flux 3, compare them side by side, and cut the winner on the built-in timeline without leaving the workspace.