Kling 4.0 — Up to 30 seconds, with sound
Kling 4.0 is the newest Kling video model. It supports text-to-video, image-to-video from a first frame, first and last frame, and reference-to-video with up to 10 reference images. You can pick 720p or 1080p, set the duration anywhere from 3 to 30 seconds, and choose 16:9, 9:16, 1:1 or 21:9 for text and reference generations. Every clip comes with an audio track.
Highlights
3–30 s · 720p / 1080p · Text to video · Image to video · First and last frame · Reference to video
Best for
Longer single takes, wide 21:9 framing, and scenes that need several reference images to stay consistent.
Input
Text, first frame, last frame, up to 10 reference images
Output
Video with audio
Checking your session…
Pricing
Prepaid in US dollars. The hold is converted to a charge when the run completes. If a run fails or times out, the hold is released in full.*
Prices as of November 2, 2026 (price list v12).
Note: if a finished output is blocked by output moderation for a policy violation, the run is still charged. You can contact support for a manual review.
Cost of your first test
$0.50
One 3-second clip at 720p.
What your top-up buys
Top up$15
≈ 29 test runs
$50
≈ 99 test runs
$100
≈ 198 test runs
Top-ups are $15–$1,000. No free tier, no subscription.
How much does a 5, 10, 15 or 30-second Kling 4.0 clip cost?
A 10-second Kling 4.0 clip costs $1.68 at 720p (price list v12, November 2, 2026). Each total below is the per-second price × seconds, the same in every mode.
| Resolution | Per second | 5 s | 10 s | 15 s | 30 s |
|---|---|---|---|---|---|
| 720p (default) | $0.168 | $0.84 | $1.68 | $2.52 | $5.04 |
| 1080p | $0.252 | $1.26 | $2.52 | $3.78 | $7.56 |
Totals are rounded to the cent; your quote shows the exact amount before you run anything. Live rates: Pricing · GET /v1/pricing.
| Model | Mode | Resolution | Our price | Official | You save |
|---|---|---|---|---|---|
Kling 4.0 Kuaishou | Text to video720p | 720p | $0.168/s | ||
Kling 4.0 Kuaishou | Text to video1080p | 1080p | $0.252/s | ||
Kling 4.0 Kuaishou | Image to video720p | 720p | $0.168/s | ||
Kling 4.0 Kuaishou | Image to video1080p | 1080p | $0.252/s | ||
Kling 4.0 Kuaishou | First and last frame720p | 720p | $0.168/s | ||
Kling 4.0 Kuaishou | First and last frame1080p | 1080p | $0.252/s | ||
Kling 4.0 Kuaishou | Reference to video720p | 720p | $0.168/s | ||
Kling 4.0 Kuaishou | Reference to video1080p | 1080p | $0.252/s |
What is the Kling 4.0 API?
Kuaishou released Kling 4.0 on October 15, 2026, and it has been available on the Makernice API since October 30, 2026. The Kling 4.0 API generates video with audio in four modes: text-to-video, image-to-video, first and last frame, and reference-to-video. Image-to-video and first and last frame follow the shape of your input image, so they take no aspect ratio. Reference-to-video takes up to 10 images that the prompt can describe together.
Spec sheet
Parameters, limits and billing rules to check before you call it.
Model id
kling-4.0 · Kuaishou
Modes
t2v Text to video · i2v Image to video · flf First and last frame · r2v Reference to video
Duration
3–30 seconds (default 5)
Resolution
720p (default) · 1080p
Aspect ratio (t2v, r2v)
16:9 · 9:16 · 1:1 · 21:9
Reference images
Up to 10, in reference_images
Audio
Always on (no toggle)
Image input
JPEG / PNG / WebP, up to 10 MB each, or an https link. Uploaded images can be used for 6 days.
Output
Video with audio. Files are kept about 30 days, so download them promptly.
Price
From $0.168/s · Quotes are locked for 12 minutes. Per-resolution prices are in the table above.
Failed runs
Failed, timed-out or canceled-while-queued runs release the hold in full.
4 ways to generate, one endpoint
Set mode, send the inputs it needs — that's it.
Text to video
mode: "t2v" · prompt
Just a prompt — the model builds the shot from scratch.
Image to video
mode: "i2v" · image_url
Send an image in image_url and it becomes the opening frame.
First and last frame
mode: "flf" · image_url + last_image_url
Set the first and last frame; the model animates everything in between.
Reference to video
mode: "r2v" · reference_images (≤ 10)
Add up to 10 reference images to lock in characters, products and style.
What you can build with this model
Workflows this model is a good fit for.
Long single takes
Generate one continuous shot of up to 30 seconds instead of stitching several short clips.
Try it in the playgroundConsistent characters and products
Pass up to 10 reference images so a person, product or setting keeps its look across the clip.
Try it in the playgroundPlanned start and end shots
Give a first and last frame to control exactly where a transition starts and lands.
Try it in the playgroundWhy run Kling 4.0 on Makernice
Quote before you pay
Every run gets an exact quote first, locked for 12 minutes. You're charged that amount — never more.
Failed runs are free
The hold is converted to a charge when the run completes. If a run fails or times out, the hold is released in full, and so does canceling while it's queued. Note: if a finished output is blocked by output moderation for a policy violation, the run is still charged. You can contact support for a manual review.
Switch models with one field
Same request, key, balance and console for all 17 models. Not happy with the result? Change model and run it again.
Prepaid, no subscription
Top up a US-dollar balance and pay per run. No monthly fee, no subscription.
Your balance never expires
Topped-up balance stays in your account indefinitely. No inactivity fees, no decay.
Automatic failover
If an upstream channel goes down, your request is routed to a backup channel automatically — no code changes on your side.
Which should you pick: Kling 4.0, Kling 3.0 Pro, Kling 3.0 Standard, Kling 3.0 4K?
Compare modes, length, resolution and references, then run the same prompt on each.
| Kling 4.0 | Kling 3.0 Pro | Kling 3.0 Standard | Kling 3.0 4K | |
|---|---|---|---|---|
| Modes | Text to video · Image to video · First and last frame · Reference to video | Text to video · Image to video · First and last frame | Text to video · Image to video · First and last frame | Text to video |
| Duration | 3–30 s | 3–15 s | 3–15 s | 3–15 s |
| Resolution | 720p / 1080p | 1080p (single tier) | 720p (single tier) | 4K (single tier) |
| Reference images | Up to 10 | Not supported | Not supported | Not supported |
| Audio | Always on (no toggle) | Always on (no toggle) | Always on (no toggle) | Always on (no toggle) |
| Starting price | $0.168/s | $0.1612/s | $0.1209/s | $0.5142/s |
Full comparison → Kling 4.0 vs Kling 3.0 · Kling 4.0 vs Seedance 2.5
Integrate Kling 4.0 in three steps
Quote, hold, charge or release — each step shows how billing works.
Create an API key
Sign in, top up and create a key in the console. Set a spend limit per key so nothing runs away.
// Console → API keys
Quote and create
POST the input to /v1/generations/quote with the model field set to kling-4.0. The price is locked for 12 minutes; creating the generation with the quote id holds that amount from your balance.
// POST /v1/generations/quote// POST /v1/generations
Poll the result
GET /v1/generations/{id} until the status is succeeded, then download the output. You're charged the quoted amount on success; failed, timed-out or canceled-while-queued runs release the hold in full.
// GET /v1/generations/{id}
Retrying with the same Idempotency-Key returns the same generation instead of charging twice.
Docs/API/KLING-4-0
API reference
Copy-paste requests for this model. The full parameter reference is in the docs.
curl https://api.makernice.com/v1/generations/quote \
-H "Authorization: Bearer $MAKERNICE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "kling-4.0",
"mode": "t2v",
"prompt": "A single handheld take following a cyclist through a crowded night market, neon signs reflecting in puddles, street sounds all around.",
"duration": 5,
"resolution": "720p"
}'Invalid request
400 invalid_request names each failing field. Fields the mode doesn't use are rejected too. Nothing is held.
Key or balance
401 means a missing or invalid key; 402 means the balance or the key's spend limit isn't enough.
Quote problems
A changed price-affecting field returns 422 quote_mismatch; an expired quote 410; a used one 409. Get a new quote.
Failed generation
A failed generation is never charged — the hold is released in full. Note: if a finished output is blocked by output moderation for a policy violation, the run is still charged. You can contact support for a manual review. Keep the generation id and retry when you're ready.
Frequently asked questions
Common questions about this model.
What is Kling 4.0?
How long can Kling 4.0 videos be?
How many reference images does Kling 4.0 support?
How much does Kling 4.0 cost per second?
Kling 4.0 vs Kling 3.0 Pro: which should I use?
Does every Kling 4.0 clip include audio?
When was Kling 4.0 released?
Kling 4.0 vs Seedance 2.5: which should I use?
Which Kling 4.0 features are not available through the Makernice API?
Prompts for Kling 4.0
Browse all prompts
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VideoKling 3.0 Standard
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VideoKling 3.0 4K
Prompt-to-4K with sound: Kling 3.0 4K turns text into 3–15 second clips with audio, priced at the 4K tier.
VideoSeedance 2.5
ByteDance's flagship for long takes: up to 30 seconds, 480p to 4K, and up to 16 reference images to keep every shot on-model. Audio is always on (no toggle).
● Start building
See what it does with your prompt
Test it in the playground, or grab an API key and ship it today.
- Quote before you pay
- Failed runs are free
- Prepaid, no subscription
- Balance never expires