Introduction
Kling 4.0 costs the least through the useapi.net Kling API, on the Kling AI subscription you already have. On Premier, a 5-second 1080p video uses $0.76 of the plan's monthly credits, or $0.152 a second (as of November 2026).
Kling's own developer API and every reseller we checked charge more per second, at 720p and at 1080p. The comparison table below has each route side by side.
useapi.net is a third-party API, not affiliated with Kling AI or Kuaishou Technology. Your videos spend your Kling AI subscription credits, and useapi.net adds no per-video charge. We read Kling's own prices and every reseller's live on November 5, 2026, and converted each one to the cost of the same video, so the routes compare like for like.
Official Kling 4.0 API pricing
Kling's own developer API went live with Kling 4.0 between October 25 and 28, 2026, and now lists Kling 4.0 and 4.0 Flash as fully launched. It sells them in prepaid packs that cover only these two models, from $500 for 3,250 units, valid 180 days, so a unit costs $0.154.
Kling 4.0 takes 1 unit a second at 720p and 1.5 at 1080p. That is $0.154 and $0.231 a second, or $1.15 for a 5-second 1080p video. Kling 4.0 Flash takes 0.6 units a second at 720p, $0.092 a second or $0.46 for 5 seconds (as of November 5, 2026). With an input video, Kling also bills its length: twice the output seconds when the input is no longer than the output, otherwise input plus output, at 0.6 units a second (0.9 at 1080p) for Kling 4.0 and 0.4 for Flash. Kling's other developer packs, from $700, don't cover Kling 4.0.
Kling 4.0 on a Kling AI subscription
Through useapi.net, Kling 4.0 (kling-v4-0) runs on your Kling AI subscription's credits, 10 a second at 720p and 15 at 1080p on every plan. Kling 4.0 Flash (kling-v4-0-flash) takes 6 a second at 720p. This is what one video costs on each plan, at the regular monthly price (as of November 2026):
| Kling 4.0 | Official API $500 pack | Premier $80.96/m 8,000 cr/mo | Pro $32.56/m 3,000 cr/mo | Standard $8.80/m 660 cr/mo |
|---|---|---|---|---|
| 720p, 5 s | $0.77 $0.154 a second | $0.51 / 50 cr $0.101 a second, 160 videos/mo | $0.54 / 50 cr $0.109 a second, 60 videos/mo | $0.67 / 50 cr $0.133 a second, 13 videos/mo |
| 1080p, 5 s | $1.15 $0.231 a second | $0.76 / 75 cr $0.152 a second, 106 videos/mo | $0.81 / 75 cr $0.163 a second, 40 videos/mo | $1.00 / 75 cr $0.200 a second, 8 videos/mo |
| 1080p, 10 s | $2.31 | $1.52 / 150 cr 53 videos/mo | $1.63 / 150 cr 20 videos/mo | $2.00 / 150 cr 4 videos/mo |
| 1080p, 30 s | $6.92 | $4.55 / 450 cr 17 videos/mo | $4.88 / 450 cr 6 videos/mo | $6.00 / 450 cr 1 video/mo |
| 4.0 Flash, 720p, 5 s | $0.46 $0.092 a second | $0.30 / 30 cr $0.061 a second, 266 videos/mo | $0.33 / 30 cr $0.065 a second, 100 videos/mo | $0.40 / 30 cr $0.080 a second, 22 videos/mo |
- The Official API column is Kling's developer API at its smallest regular Kling 4.0 pack, $500 for 3,250 units, valid 180 days.
- 1080p (
mode: pro) needs a paid Kling AI subscription, and Standard is the smallest paid one. Kling 4.0 Flash makes 720p only. - Ultra+ ($544.99 a month for 57,000 credits) brings 1080p down to $0.143 a second and 720p to $0.096. Billed yearly, Premier ($728.64 a year) is $0.114 a second at 1080p and Ultra+ ($4,902.99 a year) is $0.108. The yearly figures assume you use the credits.
- The same credit price applies on all three Kling 4.0 endpoints: text-to-video, image-to-video with start, end and keyframe images, and Omni with reference images, elements and voices. Every video comes with a stereo soundtrack, from 3 to 30 seconds.
- Kling 4.0 Flash runs on the same three endpoints, from a prompt, from a start image, or with Omni references other than voices (
omni_version: v4-flash), 3 to 20 seconds with sound.
The cost calculator on the Kling API page prices Kling 4.0 and every other Kling model on each subscription, yearly billing included.
Kling 4.0 API pricing across resellers
Several API resellers already sell Kling 4.0 per second of output. Here is every rate we could verify, read from each vendor's live page on November 5, 2026, with no video input:
| Route | 720p, per second | 1080p, per second | 1080p, 5 s | Notes |
|---|---|---|---|---|
| useapi.net, Kling Premier | $0.101 | $0.152 | $0.76 | 106 five-second 1080p videos a month on the $80.96 plan |
| useapi.net, Kling Pro | $0.109 | $0.163 | $0.81 | 40 five-second 1080p videos a month on the $32.56 plan |
| UnificAlly | $0.126 | $0.189 | $0.95 | list rate, its 10% launch sale ended October 29 |
| Kie.ai | $0.1425 | $0.2125 | $1.06 | about 10% less with the bonus credits on larger top-ups |
| Kling developer API | $0.154 | $0.231 | $1.15 | prepaid Kling 4.0 packs from $500, valid 180 days |
| fal.ai | $0.157 | $0.235 | $1.18 | the same rate for text-to-video and image-to-video |
| Runware | $0.157 | $0.235 | $1.18 | |
| WaveSpeedAI | $0.157 | $0.235 | $1.18 | its Generate button showed 20% off on November 5, $0.94 for 5 s at 1080p |
| useapi.net, PixVerse Premium | $0.20 | $0.30 | $1.50 | on the $60 PixVerse Premium plan, 40 five-second 1080p videos a month |
| useapi.net, PixVerse Pro | $0.25 | $0.375 | $1.88 | on the $30 PixVerse Pro plan, 16 five-second 1080p videos a month |
| useapi.net, PixVerse Ultra | $0.318 | $0.478 | $2.39 | on the $199 PixVerse Ultra plan with its 20% off, 83 five-second 1080p videos a month |
Kling 4.0 also runs on a PixVerse subscription through the useapi.net PixVerse API (kling-4.0), but on every PixVerse plan it costs more per second than on a Kling subscription.
Kling 4.0 Flash is on sale at four of these resellers, at 720p only: $0.0799 a second on Runware, $0.085 on Kie.ai, and $0.094 on fal.ai and WaveSpeedAI, while UnificAlly lists it as coming soon. Through useapi.net, Flash costs $0.061 a second on Kling Premier and $0.065 on Pro (as of November 5, 2026).
The "Kling 4.0 API price" quoted around the web, about $0.11 to $0.14 a second, is the 720p rate, and the lowest of those, $0.1134, was UnificAlly's launch sale, which has ended. When you compare, match the resolution and check for a promotion.
What the subscription figures assume
A subscription price per video holds when you use the plan's credits. Premier's 8,000 credits a month make 106 five-second 1080p videos or 17 thirty-second ones. For more volume, connect several Kling accounts to one useapi.net token and it spreads jobs across them (Run several Kling accounts), or buy Kling credit top-ups.
Kling also sets the price. Its launch discount on Kling 4.0 for subscribers has ended, and on November 5, 2026 every plan paid the full 10 and 15 credits a second, as in the tables above. Check the live plans page before you commit spend. At full price, Premier's $0.152 a second at 1080p stays below every 1080p reseller rate above.
To make your first Kling 4.0 video, the Kling 4.0 tutorial walks through one real run with curl, from the request to the downloaded MP4, plus 1080p, 30-second, 21:9 and keyframe variants.
Examples
Kling 4.0 » kling-v4-0, text-to-video, std 720p, 3 seconds, 16:9
This video took 27 credits off a Kling Pro subscription on October 18, 2026, during Kling's launch discount, with its stereo soundtrack. At the full price Kling charges now (November 2026), the same clip uses 30 credits, $0.33 at Pro's credit price. The prompt and every response are in the Kling 4.0 tutorial.
Questions
How much does the Kling 4.0 API cost?
Through useapi.net, a 10-second 1080p Kling 4.0 video uses $1.52 of a Kling Premier subscription's credits, against $2.31 on Kling's own developer API and $2.35 on fal.ai (as of November 5, 2026). The price table shows every length on each plan.
What is the Kling 4.0 price per second?
Through useapi.net, Kling 4.0 costs $0.152 a second at 1080p and $0.101 at 720p on Kling Premier (as of November 2026). That is lower than every reseller we checked, whose rates start at $0.189 and $0.126 (as of November 5, 2026). Kling 4.0 Flash costs $0.061 a second on Premier, against $0.092 on Kling's developer API and from $0.0799 at resellers. The reseller table lists each one.
What does a 30-second Kling 4.0 video cost?
Through useapi.net, a 30-second 1080p Kling 4.0 video, the longest single generation, uses $4.55 of a Premier subscription's credits or $4.88 on Pro, against $6.92 on Kling's developer API and $7.05 on fal.ai (as of November 5, 2026). Premier makes 17 of them a month.
Do I need a prepaid pack or a Kling API key?
Through useapi.net, no: you need a useapi.net API token and a Kling AI subscription from Standard at $8.80 a month, connected once through Setup Kling. Kling's own developer API needs a separate developer account and a prepaid Kling 4.0 pack from $500, valid 180 days (as of November 5, 2026).
Kling's subscription and developer API prices and every reseller price in this article were read on November 5, 2026. Kling, the resellers and their promotions change often, so confirm the live rate before you scale. Connect your Kling account with Setup Kling, price any model on the Kling API page, and a useapi.net subscription runs Kling and every other API with one token, including the hosted Kling MCP server for Claude Code, Cursor and VS Code.
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