Seedance 2.0 AI動画生成

Seedance 2.0 is ByteDance's flagship text-to-video model and one of the most flexible options on FlyAIgh — it generates clips anywhere from 4 to 15 seconds in seven aspect ratios (16:9, 9:16, 4:3, 1:1, 3:4, 21:9 and the model-adaptive 'adaptive' option that lets the AI pick).

The family ships in two variants. Seedance 2.0 Pro is the flagship at 8 credits per second (at 720p) — strongest motion coherence, best camera work, most expressive character animation, and the only variant that renders 1080p and 4K. Seedance 2.0 Fast trims that to 7 credits per second at 720p for lower-cost iteration where the final polish isn't critical.

Both variants share four input modes: pure text-to-video, image-to-video (single first frame), first/last frame control, and multimodal reference-to-video — the standout capability where you supply not just images but reference videos and audio (up to nine images, three videos and three audio tracks) and Seedance composes them into a coherent new scene that follows your prompt. Images can fix a character, product or style; a reference video can carry a look or camera move; reference audio can drive the soundtrack. This is what powers FlyAIgh's video-to-video workflow, and makes Seedance the strongest pick when brand assets, hero products or returning characters must appear unchanged across clips.

Native synchronized audio is included in every generation — dialogue, ambient sound, music. Seedance 2.0 Pro renders up to 4K (720p, 1080p and 4K); Fast tops out at 720p, both across seven aspect ratios.

Seedance is particularly strong at cinematic camera moves, stylized animation, and scenes that need multi-subject consistency. It is weaker than VEO 3.1 Quality for ultra-fine textural detail and weaker than Sora 2 Pro for photorealistic indoor lighting. Pick Seedance when reference fidelity and aspect-ratio flexibility matter more than per-pixel realism.