CREDITS & PRICING • Framework updated · Jul 2026
AI Video Credit Rollover and Expiry: Budget Risks to Check Before You Pay
Most AI video pricing pages advertise a monthly credit allotment, but the fine print on what happens to unused credits is where budgets quietly leak. Across the major tools, subscription credits usually expire at each billing reset while separately purchased credits carry a much longer validity window. This guide shows how those rules change your real cost per usable clip and gives you a checklist to run before you subscribe.
Why expiry belongs in your cost math
A plan's headline price implies a tidy cost per clip: divide the monthly fee by the number of clips the credit allotment could produce. That figure only holds if you actually spend every credit before the cycle resets. Most providers treat unused subscription credits as use-it-or-lose-it, so any allotment you leave on the table each month is money spent for nothing. Two categories of credit behave very differently here. Recurring subscription credits, included with your plan, tend to have a short life tied to the billing date. Separately purchased top-up credits usually carry a far longer validity window. Knowing which bucket a credit sits in tells you whether an idle balance is a temporary reserve or a countdown to zero. Treat the expiry rule as a line item, not a footnote, before you compare plans on price alone.
How the four providers handle rollover
The pattern is consistent. On Runway, included monthly credits on the Standard and Pro plans do not roll over; they reset within 24 hours of your billing date each cycle, and only the top Max plan lets up to one month of unused credits carry forward. Luma Dream Machine states plainly that unused monthly credits do not roll over to the next month when the account resets for a new billing cycle. Pika markets its separately purchased credits as rollover credits, which signals that the standing monthly plan allotment does not carry the same guarantee. Kling's membership subscription credits are valid for one month from the date they are distributed, so each monthly allotment lapses on its own schedule rather than accumulating. In every case, the recurring allotment is effectively a monthly deadline, not a growing balance you can bank for a big project later.
How expiry changes your effective cost per clip
Put it in variables. Say a plan costs P per month and grants M credits, and a finished clip consumes C credits after your typical retries. The advertised cost per clip is P divided by M over C, assuming you burn the whole allotment. In practice you make N usable clips, using N times C credits. Whenever N times C is less than M, the leftover credits expire, yet you still paid P. Your real cost per usable clip is P divided by N, which climbs as your usage falls below the allotment. Retries make this worse: every discarded generation still spends credits but does not add to N, so a high retry rate both drains the allotment faster and lowers the usable count. The lesson is that a larger plan only reduces cost per clip if you reliably consume its credits within the cycle. Idle capacity on a use-it-or-lose-it plan raises the number you were trying to reduce.
Purchased credits as an expiry hedge
The mirror image of short-lived subscription credits is the long life of purchased ones. Runway states that any additional credits you buy never expire. Luma's Top-Up credits are valid for twelve months, roll over across billing cycles, and are consumed automatically only after your monthly credits run out; they even survive a cancellation or a downgrade to the free tier, staying hidden but valid until you return to a paid plan. Kling's separately purchased credits are valid for two years from the date of distribution. Pika likewise frames its buyable credits as ones that roll over. This makes top-ups a hedge against the monthly deadline: if your workload is uneven, a smaller base plan plus top-ups can protect credits that a larger subscription would have expired. Verify the current validity window on the provider's official page before you rely on it, since these terms change.
Right-sizing the plan to real usage
Choose the plan whose allotment matches what you can realistically consume before reset, not the one with the most credits. If your output is steady, a mid tier you fully burn beats a large tier you leave half-unused. If your output is lumpy, prioritize either rollover or long-lived top-ups: Runway's Max plan is the only one of these tiers that banks up to a month of unused subscription credits, while purchased top-ups serve the same purpose elsewhere. Watch for gates that push you toward extra spending too. On Luma, the lower paid tiers stop generating once credits run out, so you must buy top-ups or wait for the next billing cycle, while only the top tiers include a relaxed mode that keeps producing after fast credits are spent. On Pika, the free tier is capped at lower resolution. Each of these can quietly raise your effective cost, so weigh the expiry rule, the feature gates, and your genuine monthly volume together.
Editorial note: This framework is general information, not a vendor endorsement. Check the current pricing, terms, and data-handling details directly with the provider before buying.