Kling 4.0 Flash: Fast, Low-Cost AI Video Drafts

Kling 4.0 Flash is the quick, cheaper tier of Kling 4.0. It turns a prompt or a single image into a 3–20 second 720p clip with sound, so you can test an idea and make variants before you pay for a final render. Try Kling 4.0 Flash online now!

Seedance 2.5

Up to 30s clips with image, video and audio references.

Kling 4.0

Kuaishou's newest model: 3–30s clips at up to 1080p.

Wan 3.0

Up to 30s clips with native audio and lip-synced dialogue.

GPT Image 2.5

Generate and edit images with OpenAI's newest model.

Nano Banana 2.1

Google's image model: sharper detail and cleaner text.

Seedance 2.0

Multi-shot cinematic video with native audio and lip sync.

Kling 4.0 Flash Video Examples

Riders in the dawn mist21:9 · 5 s

Ramen close-upFood · 1:1 · 5 s

The rider tips his hatImage to video · 5 s

The cat comes to say helloImage to video · 5 s

Golden-hour surf, vertical9:16 · 5 s

Make a Kling 4.0 Flash video

Kling 4.0 Flash Features at a Glance

Kling 4.0 Flash Text to Video in About Two Minutes: Type a prompt and a 5-second 720p clip with sound comes back in a minute and a half to three minutes.
Kling 4.0 Flash Variants for Every Format: Each clip costs little, so you can run one idea in 16:9, 9:16 and 1:1, or try several takes, and keep the best.
Kling 4.0 Flash Image to Video From One Start Frame: Upload a photo or a frame and Flash animates it, keeping the subject, light and framing of your image.
Kling 4.0 Flash Native Audio and Speech: Every clip comes back with a stereo track: ambience, effects and, when you quote a line, speech.
Kling 4.0 Flash Clips up to 20 Seconds: Pick any length from 3 to 20 seconds; 5 seconds is the default.
Kling 4.0 Flash Settings for Length, Ratio and Inputs: Length, resolution, aspect ratio, inputs and prompt limits as the generator offers them today.

Kling 4.0 Flash Text to Video in About Two Minutes

Flash is built for turnaround. In our tests on November 4, 2026, a 5-second clip came back in 89 seconds when it ran on its own, and five clips started together were all done within 192 seconds. A 3-second Kling 4.0 clip took 170 seconds in our earlier test.

Everything in this surfer shot comes from the prompt below: the low tracking camera, the backlit spray and the slow motion.

Kling 4.0 Flash Text to Video in About Two Minutes – Kling 4.0 Flash — Prompt: A surfer carves through a glowing turquoise wave at golden hour. Spray catches the low sun as the board cuts a white arc across the water. The camera skims just above the surface and tracks alongside him in slow motion. Warm cinematic color, shallow depth of field. (Kling 4.0 Flash · 16:9 · 5s · 720p)

Kling 4.0 Flash Variants for Every Format

A short-video campaign usually needs the same idea in several shapes: a wide cut for YouTube, a vertical one for Reels and TikTok, a square one for the feed. With Flash those extra versions cost about 40% fewer credits than with Kling 4.0.

This vertical clip used the exact prompt of the surfer shot above; only the aspect ratio changed to 9:16. Flash reframed the scene instead of cropping it.

Kling 4.0 Flash Variants for Every Format – Kling 4.0 Flash — Prompt: A surfer carves through a glowing turquoise wave at golden hour. Spray catches the low sun as the board cuts a white arc across the water. The camera skims just above the surface and tracks alongside him in slow motion. Warm cinematic color, shallow depth of field. (Kling 4.0 Flash · 9:16 · 5s · 720p)

Kling 4.0 Flash Image to Video From One Start Frame

Add a start frame and describe what happens next. The clip takes the shape of your image, so there is no aspect ratio to pick, and the subject, colors and lighting carry over from the still.

The start frame here is a still from one of our own Flash clips. Flash takes a start frame only; for a shot pinned at both ends, use Kling 4.0, which also accepts a last frame.

Kling 4.0 Flash Image to Video From One Start Frame – Kling 4.0 Flash — Start frame

Kling 4.0 Flash Native Audio and Speech

Flash generates sound together with the picture, so a draft already has the room tone, footsteps or waves it needs. There is no switch to turn sound off; mute the clip afterwards if you plan to add music.

In this selfie-style clip the prompt gave the woman one line to say in quotation marks, the format that works best for short spoken lines.

Kling 4.0 Flash Native Audio and Speech – Kling 4.0 Flash — Prompt: Handheld selfie video in a sunny kitchen. A young woman with curly hair holds a small green ceramic mug up to the phone camera, smiles and says: "Okay, this is the mug I drink from every single morning." She takes a sip and laughs. Natural daylight, casual social-media look, room tone and her voice only. (Kling 4.0 Flash · 9:16 · 5s · 720p)

Kling 4.0 Flash Clips up to 20 Seconds

Short loops for ads and social posts are where Flash fits best, but one generation can run to 20 seconds when a moment needs room, such as a slow reveal or a small story with two or three beats.

This 10-second clip follows a cat from watching the snow to touching the glass. Longer clips cost more credits, since Flash is charged per second.

Kling 4.0 Flash Clips up to 20 Seconds – Kling 4.0 Flash — Prompt: A small orange cat sits on a windowsill watching snow fall outside at night. It reaches one paw up to the cold glass, pulls it back, then turns its head toward the camera and blinks slowly. Cozy warm lamp light inside, soft blue snow light outside, gentle handheld camera, quiet room sound and a faint purr. (Kling 4.0 Flash · 16:9 · 10s · 720p)

Kling 4.0 Flash Settings for Length, Ratio and Inputs

These are the settings the generator gives you for Kling 4.0 Flash, so what you plan is what you can render.

Length	3 to 20 seconds5 seconds by default.
Resolution	720pThe only option for Flash.
Aspect ratio	16:9, 9:16, 1:1 or 21:9With a start frame, the clip takes the shape of your image.
Inputs	Text, or text plus a start frameNo last frame, reference images or video editing for Flash here.
Prompt	Up to 2,500 characters
Sound	Always onStereo ambience, effects and speech in every clip.
Credits	Charged per secondThe generator shows the total before you start, and the price table below lists common lengths.

Kling 4.0 Flash Use Cases

Flash is the model for drafts, tests and volume: cheap enough to run often, quick enough to iterate on.

Ad and social drafts: Test a hook, a product angle or a mood before you commit a bigger budget to the final cut.
Format variants: Run one prompt in 16:9, 9:16 and 1:1 for YouTube, Reels, TikTok and the feed.
Storyboards and animatics: Turn each panel or frame into a moving shot to check pacing and camera moves.
B-roll and loops: Food close-ups, landscapes and product details for edits that need a lot of short footage.
Bringing stills to life: Animate a photo, a render or a frame from another clip from a single start image.

Kling 4.0 Flash vs Kling 4.0, Seedance 2.0 Fast, Seedance 2.0 Mini and Kling 3.0

Every cell except the last row comes from the models’ live settings on SeedVideo AI, so the table matches what the generator lets you pick today.

Kling 4.0 Flash runs inside SeedVideo AI’s free AI video generator, next to Kling, Veo and Wan, on one credit balance.

Kling 4.0 Flash compared with other video models on SeedVideo AI
Feature	Kling 4.0 Flash	Kling 4.0	Seedance 2.0 Fast	Seedance 2.0 Mini	Kling 3.0
Longest clip	20 s	30 s	15 s	15 s	15 s
Top resolution	720p	1080p	1080p	720p	4K
Aspect ratios	16:9, 9:16, 1:1, 21:9	16:9, 9:16, 1:1, 21:9	16:9, 9:16, 1:1, 4:3, 3:4, 21:9	16:9, 9:16, 1:1, 4:3, 3:4, 21:9	16:9, 9:16, 1:1
Reference images	No	No	9	9	No
Reference videos	No	No	3	3	No
Edit and extend a clip	No	No	No	No	No
Credits for 5 s at 720p	14 credits	24 credits	19 credits	13 credits	13 credits
Best for	Fast, low-cost 720p drafts and variants with sound	Final Kling renders up to 30 s and 1080p, with a last frame	Quick Seedance clips with reference images	The cheapest tests, included on the free plan	Kling clips up to 15 s at up to 4K

Credits are credit-pack rates for a 5-second 720p clip; subscriptions cost less per second.

Kling 4.0 Flash Pros and Cons

What it does well on SeedVideo AI today, and what to work around.

Strengths

Speed: A 5-second clip came back in 89 seconds in our test, roughly half the wait of Kling 4.0.
Price: About 40% fewer credits per second than Kling 4.0 at 720p.
Sound: Every clip has a stereo track with ambience, effects and speech.
Formats: 16:9, 9:16, 1:1 and 21:9 from the same prompt.

Limits

Resolution: 720p only; use Kling 4.0 for 1080p.
Frame control: A start frame only, no last frame.
Length: Up to 20 seconds, against 30 for Kling 4.0.
Modes on this site: Kling’s Omni Reference and video edit modes for Flash are not available here yet.

What Kling 4.0 Flash Costs and How You Can Start

Starting points for Kling 4.0 Flash

Pick a starting point below and the generator opens with Kling 4.0 Flash selected.

Text to video

Kling 4.0 Flash price per clip

Credit-pack prices, pulled from the generator’s current settings. Subscriptions cost less per second.

Resolution	5 s	10 s	20 s
720p	14 credits	28 credits	56 credits

Credit packs and plans

How to Use Kling 4.0 Flash in 4 Steps

Step 1
Pick Kling 4.0 Flash
Use the composer at the top of this page, or open the generator and choose Kling 4.0 Flash in the model menu.
Step 2
Describe the shot
Write the subject, the action, the camera move and the sound you want, in up to 2,500 characters. Put spoken lines in quotation marks.
Step 3
Add a start frame if you have one
Upload an image to start the clip from it. Without one, Flash builds the scene from your words.
Step 4
Set length and ratio, then generate
Pick 3 to 20 seconds and an aspect ratio, check the credit total and start. The clip usually lands in two to three minutes.

Generate with Kling 4.0 Flash

Kling 4.0 Flash Prompt Examples

Prompts we ran on Kling 4.0 Flash for this page, each beside the clip it produced, untouched. Load one into the generator, then change the subject, the setting or the format.

Ramen close-up
Text to video · 1:1 · 5 s
Close-up of a steaming bowl of ramen on a worn wooden counter. Chopsticks lift a tangle of glossy noodles toward the camera, broth drips back into the bowl, and steam curls through warm backlight. Shallow depth of field, slow push-in, appetizing food-commercial look.
Try this prompt
Riders in the dawn mist
Text to video · 21:9 · 5 s
Wide cinematic shot of three riders on horseback crossing a misty valley at dawn. Sun rays break through the fog behind them, the horses kick up dew from the grass, and the camera slowly pushes forward at ground level. Epic film look, muted greens and gold.
Try this prompt
Cat watching the snow
Text to video · 16:9 · 10 s
A small orange cat sits on a windowsill watching snow fall outside at night. It reaches one paw up to the cold glass, pulls it back, then turns its head toward the camera and blinks slowly. Cozy warm lamp light inside, soft blue snow light outside, gentle handheld camera, quiet room sound and a faint purr.
Try this prompt
Selfie with a line of dialogue
Text to video · 9:16 · 5 s
Handheld selfie video in a sunny kitchen. A young woman with curly hair holds a small green ceramic mug up to the phone camera, smiles and says: "Okay, this is the mug I drink from every single morning." She takes a sip and laughs. Natural daylight, casual social-media look, room tone and her voice only.
Try this prompt

Read the prompt-writing guide

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Kling 4.0 Flash FAQ

What is Kling 4.0 Flash?

Kling 4.0 Flash is the fast, lower-cost tier of Kuaishou’s Kling 4.0 video model. Kling opened it to a limited group on September 28, 2026. It makes 3–20 second clips at 720p with sound, from text or from a start image.

How is Kling 4.0 Flash different from Kling 4.0?

Flash is quicker and cheaper but smaller in scope: 720p instead of up to 1080p, 20 seconds instead of 30, and a start frame without a last frame. On SeedVideo AI it uses about 40% fewer credits per second than Kling 4.0.

How much does Kling 4.0 Flash cost?

Flash is charged per second of video. The price table on this page shows the credits for common lengths, and the generator shows the exact total before you start.

Is Kling 4.0 Flash free?

No. Kling 4.0 Flash runs on paid plans and credit packs. The free plan includes Seedance 2.0 Mini for testing at no cost.

How long does a Kling 4.0 Flash video take?

In our tests on November 4, 2026, 5-second clips took between 89 and 192 seconds, depending on how many jobs were running. Longer clips take a little longer.

Does Kling 4.0 Flash generate sound?

Yes. Every clip comes with a stereo track: ambience, sound effects and speech when the prompt includes a spoken line. Sound cannot be switched off.

Can I use a last frame or reference images with Kling 4.0 Flash?

Not on SeedVideo AI yet. Flash runs from text or one start frame here. For a first and last frame, use Kling 4.0; for many reference images, use Seedance 2.5.

Is SeedVideo AI affiliated with Kling AI or Kuaishou?

No. SeedVideo AI is an independent platform that runs Kling models through an upstream API. It is not operated by, endorsed by or affiliated with Kuaishou or Kling AI.

Make Your First Kling 4.0 Flash Video

Write a prompt or add a start frame, pick a length and a format, and get a draft with sound in a few minutes.

Open the generator