Choosing an AI Video Model: Length, Sound & Cost

The video models side by side

Model	Type	Starts from	Length / formats	Resolution	Credits	Plans
Seedance 2.0ByteDance	Video	Text or a photo	5–10 sec	1080p	—	Every plan
Seedance 2 FastByteDance	Video	Text or a photo	5–15 sec	720p	100 credits / 5 sec, 250 credits / 10 sec, 325 credits / 15 sec	Every plan
Seedance 2.5ByteDance	Video	Text or a photo	5–30 sec	720p	216 credits / 5 sec, 332 credits / 10 sec, 447 credits / 15 sec, 563 credits / 20 sec, 794 credits / 30 sec	Every plan
Kling 3.0Kling AI	Video	Text or a photo	5–15 sec	—	—	Every plan
Gemini OmniGoogle	Video	Text or a photo	10 sec	720p	244 credits / 10 sec	Every plan
Veo 3.1 FastGoogle	Video	Text or a photo	4–8 sec	1080p	154 credits / 4 sec, 184 credits / 6 sec, 214 credits / 8 sec	Every plan
Kling 3.0 OmniKling AI	Video	Text or a photo	5–15 sec	1080p	219 credits / 5 sec, 359 credits / 10 sec, 499 credits / 15 sec	Every plan
Veo 3.1Google	Video	Text or a photo	4–8 sec	4K	—	Every plan
Kling Motion ControlKling AI	Video	Photo + reference video	10–30 sec	—	211 credits / 10 sec, 271 credits / 15 sec, 439 credits / 30 sec	Every plan

Seedance 2 Fast when you need a longer clip with sound, or a square format.
Gemini Omni when you need a character and a product kept the same from reference photos, with sound.
Veo 3.1 Fast when you need the highest resolution and a single, polished moment with sound.
Kling Motion Control when you need movement copied from a reference video, or the longest clips.

01How long must it be?
A single moment fits in 8 seconds; a small routine needs 15; a full dance needs longer.
02What do you start from?
Text, a photo, or a photo plus a reference video for motion.
03Does it need sound?
Some models generate sound with the video; for voice-overs, add audio afterwards.