Answer: at the resolutions both models offer, Kling 4.0 is cheaper — 6 credits per second at 720p against 12 for Seedance 2.5, and 8.9 against 21 at 1080p. Seedance 2.5 has a 480p tier at 5 credits that Kling 4.0 does not, and both render up to 30 seconds with generated audio. Both require an active Starter subscription or higher.
The comparison is refreshingly clean because the two models overlap almost exactly: same duration ceiling, same subscription requirement, same in-clip audio. The decision comes down to price per second and what each one does better.
Matched specs
| Kling 4.0 | Seedance 2.5 | |
|---|---|---|
| 480p | — | 5 credits/s |
| 720p | 6 credits/s | 12 credits/s |
| 1080p | 8.9 credits/s | 21 credits/s |
| 2K+ | — | — |
| Max duration | 30 s | 30 s |
| Audio | generated with the clip | generated with the clip |
| Subscription | Starter or higher | Starter or higher |
| Prompt length | 8,000 chars | 30,000 chars |
| Ratio set | 16:9, 9:16, 1:1, 21:9 | wider set incl. 9:16 and 21:9 |
Two rows stand out. Kling 4.0 is half the price at 720p and 1080p. Seedance 2.5 has the only 480p lane of the two, and it accepts a 30,000-character prompt — four times the length.
What a job costs in dollars
| Job | Kling 4.0 | Seedance 2.5 |
|---|---|---|
| 10 s · 720p | 60 credits ($0.60) | 120 ($1.20) |
| 30 s · 720p | 180 ($1.80) | 360 ($3.60) |
| 10 s · 1080p | 89 ($0.89) | 210 ($2.10) |
| 30 s · 480p | not offered | 150 ($1.50) |
On the top yearly plan, where a credit costs about $0.0066, those 30-second 720p takes become roughly $1.19 (Kling) and $2.38 (Seedance). The ranking does not change; every number just gets smaller.
When Seedance 2.5 is the right buy
- You want the cheapest working tier. 480p at 5 credits a second — 150 credits for thirty seconds — is the cheapest half-minute here.
- The prompt is long. 30,000 characters against 8,000 is the difference between a shot description and a shot bible.
- You need a wider ratio set for unusual placements.
When Kling 4.0 is the right buy
- You are delivering 720p or 1080p. Half the price at both.
- You want keyframe control. Ordered first and last frames are documented here and work well for moves with a destination.
- You need video-to-video restyles. 3.52 credits a second at 720p is the cheapest restyle lane either model offers.
The decision in one line
For most 720p and 1080p work, Kling 4.0 is the default and Seedance 2.5 earns its place when you need 480p economics or a very long prompt. Both are 30-second models, so the choice is about price and controls rather than capability ceilings.
Where the comparison misleads
- Credits, not dollars. On a higher plan both get cheaper; the ranking holds.
- Audio add-ons. Neither model bills audio separately, so a per-second comparison is fair.
- Quality. This table says nothing about which looks better. That is a test, not a spreadsheet — run the same prompt on both at 720p and judge the file.
FAQ
Which is cheaper for a 30-second clip? Kling 4.0 at 720p: 180 credits against 360.
Does Seedance 2.5 have a 480p tier Kling lacks? Yes — 5 credits a second, the cheapest lane of the two.
Do both generate sound? Yes, with the clip, and neither charges extra for it.
Do both need a subscription? Yes. Starter or higher on both.
The Kling per-second table is on Callirra's Kling 4.0 page and the Seedance ladder on the Seedance 2.5 page. Run one prompt on both before picking a house model — the price ordering is clear, the look is not.