Seedance 2.0 Fast
Seedance 2.0 Fast is a speed-optimized variant of ByteDance's unified multimodal audio-video generation model. It accepts text, image, audio, and video inputs in combination, like Seedance 2.0, but targets shorter wall-clock times and higher throughput for iterative workflows. It produces multi-shot videos with dual-channel synchronized audio including dialogue, ambient sound, and effects, with physics-aware motion and editing controls, while prioritizing responsiveness over the last increment of visual refinement so teams can preview and ship ideas faster.
Deserted Ice-Rink Masquerade
{
"taskType": "videoInference",
"taskUUID": "60e9f2dc-5fca-4643-b0a5-68899333a020",
"model": "bytedance:seedance@2.0-fast",
"positivePrompt": "A surreal cinematic sequence set inside a forgotten hotel ballroom converted into an ice rink. Begin with stillness and echoing emptiness, then drift into a masked midnight gala on the ice: elegant skaters emerge from shadow, traces of old celebration return, gowns and tuxedos glide in sweeping circles, reflections shimmer on scratched ice, chandeliers tremble overhead, confetti appears, a brass gramophone crackles to life at center rink, the camera moves through multiple shots with graceful tracking, close details of skates carving arcs, masks turning, breath in cold air, then the revelry grows uncanny and fragmented before collapsing back into near-solitude. Strong visual continuity between first and last frame images, expressive transitions, believable physics, rich ambient sound with skate scrapes, distant music, ballroom creaks, and murmured laughter, no subtitles, no on-screen text.",
"width": 1280,
"height": 720,
"duration": 8,
"settings": {
"audio": true
},
"inputs": {
"frameImages": [
{
"image": "https://assets.runware.ai/assets/inputs/4adeec3b-8ca8-4d6e-9913-2910a82e93f5.jpg",
"frame": "first"
},
{
"image": "https://assets.runware.ai/assets/inputs/fe0c850c-be0b-4b09-a7ab-7479a8e93652.jpg",
"frame": "last"
}
]
}
}{
"taskType": "videoInference",
"taskUUID": "60e9f2dc-5fca-4643-b0a5-68899333a020",
"videoUUID": "6e3ba975-3df3-4b82-991a-8bd6e866ad8f",
"videoURL": "https://vm.runware.ai/video/os/a03d21/ws/5/vi/6e3ba975-3df3-4b82-991a-8bd6e866ad8f.mp4",
"seed": 67357414,
"cost": 1.0422
}Abandoned Aquarium Reading Room
{
"taskType": "videoInference",
"taskUUID": "5e36b80f-17ef-4173-960a-2091317889fd",
"model": "bytedance:seedance@2.0-fast",
"positivePrompt": "Begin from the supplied first frame of an aquarium-tunnel library. The camera slowly glides forward through the reading room as suspended dust and loose paper drift gently in the air. Fish silhouettes pass behind the curved glass walls, casting wavering caustic reflections across bookshelves and tabletops. The child turns a page and looks up as a large ray glides overhead beyond the glass ceiling. Subtle parallax, natural water light patterns, soft fabric motion, tiny ripples of reflected light, believable physics, multi-shot feel with elegant pacing, immersive ambient sound of creaking shelves, distant water resonance, muffled glass hum, soft page turns, and faint footsteps on the floor.",
"width": 1280,
"height": 720,
"duration": 8,
"settings": {
"audio": true
},
"inputs": {
"frameImages": [
"https://assets.runware.ai/assets/inputs/fd32dc72-d2a3-41e2-a0bf-88241107de60.jpg"
]
}
}{
"taskType": "videoInference",
"taskUUID": "5e36b80f-17ef-4173-960a-2091317889fd",
"videoUUID": "0b033875-3d77-4ce3-b069-65721da5c805",
"videoURL": "https://vm.runware.ai/video/os/a06dlim3/ws/5/vi/0b033875-3d77-4ce3-b069-65721da5c805.mp4",
"seed": 1118129030,
"cost": 1.0422
}Moonlit Glasshouse Chess Duel
{
"taskType": "videoInference",
"taskUUID": "5047ccf4-93ea-44ee-a6d2-90592656edfe",
"model": "bytedance:seedance@2.0-fast",
"positivePrompt": "Inside a vast abandoned glasshouse at midnight, two rival chess prodigies face each other across a cracked marble table surrounded by towering tropical plants and hanging irrigation pipes. Multi-shot cinematic sequence: opening wide shot drifting through foggy panes and tangled leaves, soft moonbeams striping the floor; medium shot of black and white pieces sliding with precise finger movements; close shot of condensation trembling on the glass as distant thunder rolls outside; a hidden mechanical heater coughs to life and metal pipes ping with warmth; one player whispers, 'Your queen is trapped,' and the other replies with a calm half-laugh, 'Only if you stop looking at the board.' Final shot reveals a small cat asleep beneath the table as a decisive piece clicks into place. Naturalistic motion, subtle reflections, realistic physics in drifting mist and leaf movement, crisp ambient greenhouse acoustics, footsteps on wet stone, quiet dialogue, piece impacts, intimate suspense, polished film look.",
"width": 1280,
"height": 720,
"duration": 8,
"settings": {
"audio": true
}
}{
"taskType": "videoInference",
"taskUUID": "5047ccf4-93ea-44ee-a6d2-90592656edfe",
"videoUUID": "50993b0a-c5e6-4004-879a-c158d618db90",
"videoURL": "https://vm.runware.ai/video/os/a10dlim3/ws/5/vi/50993b0a-c5e6-4004-879a-c158d618db90.mp4",
"seed": 980750755,
"cost": 1.0422
}Deserted Funfair Oracle Pavilion
{
"taskType": "videoInference",
"taskUUID": "4c626044-58ee-4459-b752-1905a359fed6",
"model": "bytedance:seedance@2.0-fast",
"positivePrompt": "Using the three reference images, create a 10-second cinematic sequence set in a deserted funfair oracle pavilion at twilight. Blend the oracle character, the dry open fairground environment, and the divination props into one coherent world. Begin with a wide establishing shot of the striped pavilion and abandoned booths under a vast amber-violet sky, then cut to medium shots of the oracle stepping through dust and hanging pennants, then close details of spinning numbered discs, crystal prisms catching light, chalk-marked hands, and the folded mechanical parasol opening with precise motion. End on a dramatic centered shot as the pavilion machinery softly activates around the oracle. Natural camera moves, rich texture, atmospheric depth, believable fabric and metal physics, subtle ambient fairground creaks and distant wind, no spoken dialogue, polished fast-preview look.",
"width": 1280,
"height": 720,
"duration": 10,
"settings": {
"audio": true
},
"inputs": {
"referenceImages": [
"https://assets.runware.ai/assets/inputs/b178bfa1-8081-4cb1-95ae-462a2cbfa4a6.jpg",
"https://assets.runware.ai/assets/inputs/58d5b616-160f-44cf-ad63-64e6b0cdf350.jpg",
"https://assets.runware.ai/assets/inputs/6990cb47-afad-41c9-b498-2f76437b7cf2.jpg"
]
}
}{
"taskType": "videoInference",
"taskUUID": "4c626044-58ee-4459-b752-1905a359fed6",
"videoUUID": "73dff2dd-01c0-412a-90fe-8157f94d9899",
"videoURL": "https://vm.runware.ai/video/os/a03d21/ws/5/vi/73dff2dd-01c0-412a-90fe-8157f94d9899.mp4",
"seed": 1608516661,
"cost": 1.3014
}