Answer: on Callirra, Kling 4.0 costs 6 credits per output second at 720p ($0.06 at settlement) and 8.9 credits at 1080p, video-to-video is cheaper at 3.52 and 5.38, and the price per credit falls on higher plans — down to roughly $0.04 per 720p second on the top yearly plan. An active Starter subscription or higher is required.
"Cheapest" needs a unit. Every platform resells Kling behind its own credit system, so the only comparison that survives is dollars per output second at a named resolution, with audio included and the subscription requirement stated.
The numbers to compare against
| Setting | Credits / second | USD at settlement | USD on the top plan |
|---|---|---|---|
| Kling 4.0 · 720p | 6 | $0.060 | ≈ $0.040 |
| Kling 4.0 · 1080p | 8.9 | $0.089 | ≈ $0.059 |
| Kling 4.0 · 720p video-to-video | 3.52 | $0.035 | ≈ $0.023 |
| Kling 4.0 Flash · 720p | 8.5 | $0.085 | ≈ $0.056 |
The "top plan" column is what a credit costs on the highest subscription with yearly billing, where credits are cheapest. The same render, three different dollar figures — which is why list prices without a plan are only half a comparison.
Five questions that beat a price list
- Is the quote per output second, or per clip? A platform quoting "5 seconds for X" hides the duration ceiling and the marginal second.
- Does the price include audio? Kling 4.0 generates sound with the clip. A reseller that bills audio separately is not cheaper, it is differently priced.
- Which resolutions exist? 720p and 1080p here. A cheaper per-second rate at 480p is a different product.
- Is there a subscription gate? Kling 4.0 requires Starter or higher on this platform; a credit pack alone does not unlock it.
- What happens on failure? Failed jobs release their reservation — worth checking, because a "cheap" platform that keeps credits on failure is not cheap in practice.
What a real job costs
| Job | 720p | 1080p |
|---|---|---|
| 5 s product clip | 30 credits | 45 |
| 10 s social clip | 60 | 89 |
| 20 s scene | 120 | 178 |
| 30 s single take | 180 | 267 |
For a monthly content plan of twenty 10-second clips, that is 1,200 credits at 720p — more than a Starter month includes (800), which is the point at which the plan choice, not the per-second rate, becomes the deciding factor.
Why the cheapest-looking option often is not
- Credit packs without a subscription. They top up a balance; they do not unlock a subscription-gated model, so the "cheap" pack cannot run Kling 4.0 at all.
- Unlimited-style plans. Usually capped by concurrency or queue priority, which changes delivery time rather than price.
- Per-clip pricing at a short duration. A five-second quote looks great until your shot needs twenty seconds.
FAQ
Is Kling 4.0 available on the free tier? No. It requires an active Starter plan or higher; the free weekly credits can run other models.
Is video-to-video cheaper? Yes — 3.52 credits per second at 720p, because the source clip does much of the work.
Does 1080p cost 48% more? Yes: 8.9 versus 6 credits per second.
Can I get a cheaper rate by buying yearly? Yearly billing lowers the price per credit, which lowers the dollar cost of every second; the credit price itself does not change.
The live per-second table is on Callirra's Kling 4.0 page, and the credit price per plan is on the pricing page. If you find a lower per-second rate somewhere, check the resolution and whether audio is included before believing it.