Kling 4.0 has no API price yet: budget with Kling 3 rates on Sume
No Kling 4.0 API price is published. Plan with Sume's Kling 3 rate of $0.14 a second, $0.21 with audio, and see 5, 10 and 15 second totals.
Short answer
As of 2026-10-04 there is no published Kling 4.0 API price. The closed beta of Kling 4.0 Flash has been running since Sep 28 for Ultra yearly subscribers, and full Kling 4.0 is expected in October, per fal's guide and TechTimes (both read 2026-10-04). Until a price appears, budget with the Kling 3 rate Sume bills today: $0.14 a second with audio off, $0.21 with audio on.
Where the Sume rate comes from
Sume bills provider list price times 1.25. The Kling 3 Pro list rate in the pricing tables is $0.112 a second with audio off and $0.168 with audio on. Times 1.25 gives $0.14 and $0.21. Kling 3 is flat per second in those tables, so resolution does not move the number.
Totals per clip
| Clip length | Audio off at $0.14/s | Audio on at $0.21/s |
|---|---|---|
| 5 s | $0.70 | $1.05 |
| 10 s | $1.40 | $2.10 |
| 15 s | $2.10 | $3.15 |
Why not extrapolate to 30 seconds
Kling 4.0 is said to reach 30 seconds and 4K. At the Kling 3 rate a 30 second clip would be $4.20 or $6.30, but that is arithmetic, not a quote. A model that does 4K and 30 seconds may price above its predecessor, and Sume's Kling 3 stops at 15 seconds. Treat any 30 second figure as a placeholder, not a forecast.
Steps to keep the budget honest
- Put the per-second rate in one config value, not in prompts or scripts.
- Use the catalog call
GET /v1/videos/modelsto see which Kling ids exist when Kling 4.0 lands. - Read
usage.coston each finished job: that is the billable amount, and the reserve is taken at submit. - Re-price when a Kling 4.0 page shows a rate, and compare against the cheapest model that meets your length.
A worked budget for a 20-clip test
Suppose you want 20 test clips of 10 seconds each, half with audio. At Sume rates that is 10 clips at $1.40 plus 10 clips at $2.10, so $14.00 plus $21.00, or $35.00 in total. If a Kling 4.0 price later comes in at double the Kling 3 rate, the same test is $70.00; at half, $17.50. Holding the budget as a range like this lets you decide ahead of time whether the new model is worth testing before you see its rate card.
Compare that range with another model by the same arithmetic, for example Wan 3.0 at 720p, which Sume bills at $0.125 per second, so a 10 second clip is $1.25. Kling 3 with audio off at $1.40 is only 15 cents more for the same length, so the audio and motion quality you need should decide it, not the headline rate.
Caveat
If Sume lists a Kling 4.0 id, its rate will follow the provider list price at that time. Nothing here is a promise that it will be listed.
Sources
Related posts
More in Pricing
- Kling credit plans vs a USD balance for video on Sume
Kling sells credit plans from Free to Ultra. Sume has no Kling text-to-video id in its docs and bills each video job in USD from a workspace balance.
- Kling v3 Pro audio on adds 50% per second: what Sume bills
fal lists Kling v3 Pro at $0.112 a second with audio off and $0.168 with audio on. Sume bills $0.14 and $0.21 a second for the same two settings.
- LTX-2.3 at $0.06/s vs Sume 1080p models: cost per 10 seconds
fal prices LTX-2.3 at $0.06 a second at 1080p. Here is a 10-second clip on LTX, Fast, Kling 3, Wan 3.0, Omni and H3 Max, with Sume's 1.25 multiple.
- LTX-2.5 audio-to-video price vs Sume audio references
LTX-2.5 audio-to-video is billed per second of input audio: $0.13 Fast, $0.17 Pro. Sume has no audio-to-video id; audio references need an image or video too.
Written by Sume