Kling 4.0 — Specifications
Compiled by Mustafa Ihsan from the vendor’s published documentation · Last updated
| Developer | Kuaishou |
|---|---|
| Type | Video generation |
| Modality | Text, Image, Video -> Video with audio |
| Parameters | Undisclosed |
| License | Proprietary |
| Open weights | No |
| Released | 2026-10 |
| Price | from $0.094 per second |
| API providers | fal; Kling API (prepaid units); Kling AI app |
What is Kling 4.0?
Kling 4.0 is the current video model from Kuaishou’s Kling AI. It became available to everyone on 15 October 2026, and Kling’s release notes list 3- to 30-second clips, two-channel stereo audio with lip-synced dialogue, up to 10 keyframe images and up to five reference videos per generation. The notes list 720p, 1080p and 4K output, but Kling’s API price list has no 4K rate for Kling 4.0, and fal offers 720p and 1080p.
On fal, Kling 4.0 costs $0.157 per second at 720p and $0.235 at 1080p, for text-to-video and image-to-video alike, so a 10-second 1080p clip costs $2.35. Kling 4.0 Flash (720p only, up to 20 seconds) costs $0.094 per second there. Kling’s own API bills prepaid units instead: 1.0 unit per second at 720p and 1.5 at 1080p, or 0.6 for Flash. Its smallest 180-day package is $500 for 3,250 units, a discounted unit price of $0.15386, which works out to about $0.154 per second at 720p and $0.231 at 1080p. Units expire after 180 days, and jobs that start from an input video are billed on a longer duration (at least twice the output length) at 0.6 units per second at 720p.
Kling 4.0 succeeds Kling 2.5 Turbo Pro, which costs $0.07 per second on fal but only makes 5- or 10-second clips. Alibaba’s Wan 3.0 also reaches 30 seconds, at a list price of $0.10 per second at 720p. Our Kling AI guide covers the app’s plans and credits, and the AI video cost index compares per-second prices across models.
Kling 4.0 pricing
| Tier | Resolution | Price / second |
|---|---|---|
| Kling 4.0 Flash via fal | 720p | $0.09 |
| via fal | 720p | $0.16 |
| via fal | 1080p | $0.24 |
What a clip costs
| Length | Kling 4.0 Flash via fal | via fal |
|---|---|---|
| 10 seconds | $0.94 | $2.35 |
| 30 seconds | $2.82 | $7.05 |
| 60 seconds | $5.64 | $14.10 |
One successful generation. A usable shot commonly takes three to ten attempts, so multiply by your real retry rate before budgeting.
How Kling 4.0 compares
| Model | Cheapest tier | vs Kling 4.0 |
|---|---|---|
| Gemini Omni 1.2 Flash | $0.02 | 76% cheaper |
| MiniMax H3 (Hailuo 3.0) | $0.03 | 73% cheaper |
| Wan 3.0 | $0.05 | 47% cheaper |
| Wan 2.5 | $0.05 | 47% cheaper |
| Veo 3.1 | $0.05 | 47% cheaper |
| Kling 2.5 Turbo Pro | $0.07 | 26% cheaper |
| Kling 4.0 | $0.09 | this model |
| Sora 2 | $0.10 | 1.1x the price |
| Seedance 2.5 | $0.10 | 1.1x the price |
| Sora 2 Pro | $0.30 | 3.2x the price |
Frequently asked questions
How much does Kling 4.0 cost?
Kling 4.0 costs between $0.09 and $0.24 per second of output, depending on tier. The cheapest is Kling 4.0 Flash via fal at $0.09 and the most expensive is via fal at $0.24.
How much is a 30-second video with Kling 4.0?
A 30-second clip costs $2.82 on the cheapest tier and $7.05 on the most expensive, for one successful generation. A usable shot commonly takes three to ten attempts, so multiply by your real retry rate before budgeting.
Is there a cheaper alternative to Kling 4.0?
Yes. Gemini Omni 1.2 Flash is the cheapest option in our database at $0.02 per second, against $0.09 for Kling 4.0. Across a hundred ten-second clips that difference is $71.00, which is rarely enough to decide on its own - the model that needs fewer retries is usually the cheaper one in practice.
Full per-second table for every provider in the AI video generation pricing guide. Prices are the provider published list rates and change without notice.