Where unused credits go on Kling AI
Kling attaches a fixed 180-day validity to each developer package and states on the same page that the units neither roll over nor can be extended. The window, not the rate, is what decides whether a large package is cheap. As of 2026-09-22.
| Point | What the developer price page states |
|---|---|
| Validity of a package | 180 days |
| Carrying units into a later period | Stated as unavailable |
| Extending the window | Stated as unavailable |
| Where it appears | Beside the package prices, on the page carrying the rate |
Inclusion rule. Statements on the developer price page about units bought and not consumed. Statements about the consumer membership are a separate product and are not mixed in. Order. Validity first, then what happens at the end of it.
1Where Kling AI sits in this column
| Channel | Unused credits |
|---|---|
| Hedra | No answer, though the FAQ asks |
| HeyGen | Answered by billing cycle |
| invideo AI | A single sentence, and it is a refusal |
| Kling AI | A 180-day window, stated twice |
| Magnific | A year, with no monthly reset |
| Morph Studio | No answer on the page that asks |
| Pika | A feature bullet, not a rule |
| Runway | Three answers, one per plan |
| SceneMixer | Into one balance, with no lapse date |
| Synthesia | Not stated where the plans are priced |
Inclusion rule. Channels whose own priced pages say something about credits left unspent, including the ones that raise the question and leave it unanswered. A channel that never meters in credits has nothing to answer and is not listed. Order. Alphabetical by channel name.
2A fixed window turns a discount into a bet
Buying a larger package lowers the unit price, and the 180-day limit puts a deadline on realising that saving. The published rate of eight and a half cents a second is only true for units actually spent inside the window; units bought and left behind raise the rate on everything that was spent.
A production can work that out in advance, which is more than most of this register allows. Divide the package by a hundred and eighty days and the result is the daily output the discount assumes. If the schedule cannot sustain it, the smaller package is the cheaper purchase despite the worse headline figure.
3Refusing an extension is a clearer answer than silence
Two things are stated rather than omitted: no rollover and no extension. That closes the door a buyer would otherwise ask about at the worst moment, and it means a plan built on the assumption of a grace period is wrong on paper rather than wrong in a support thread.
It is worth saying that this is the helpful shape. An unanswered question about validity leaves a buyer to guess, and buyers guess generously. A published refusal is less pleasant and more usable.
4The window is on the units, not on the money
The validity is attached to a package of units rather than to a subscription period, so it does not reset monthly and it does not pause. A project delayed by three months spends a third of its window on nothing, and the arithmetic does not care why.
That makes package timing a scheduling decision rather than a procurement one. Buying at the start of production and buying when the first episode is ready to generate are the same money and different rates.
- Unused unitsAPI packages carry 180-day validity with no rollover and no extensionon the developer packages
- Published per-second price$0.084 to $0.168 per second at 720p to 1080p, and $0.42 per second at 4K
5Sources
Read from the developer price page published at kling.ai on 2026-09-22. The rate this column sits beside is on Kling AI; what the register accepts as published is on the method page. The same column on other channels: invideo AI, Pika. Every column: what each channel publishes.