Kling 4.0 is the newest Kling video model in Kolbo.AI. It makes clips from 3 to 30 seconds at 720p or 1080p with native audio, from text, a start image, first and last frames with up to 8 ordered middle frames, or mixed image, video and audio references. It can also edit an existing clip and extend one. Kling 4.0 Flash is the faster 720p version for quick iteration.
This guide covers every mode, the exact limits in each one, how credits are counted, and when to pick Kling 4.0 or Kling 4.0 Flash.
Watch the showcase
This launch film combines Kling 4.0 generations and a real video edit example, including chrome wings, an underwater transition, a paper fox and a robot. The footage was cut with music and titles for the showcase.
Kling 4.0 at a glance
| Setting | Kling 4.0 |
|---|---|
| Clip length | 3 to 30 seconds, in 1 second steps |
| Resolution | 720p or 1080p |
| Aspect ratios | 16:9, 9:16, 1:1 and 21:9 |
| Audio | Native audio, on by default, no extra charge |
| Frames | First frame, last frame and up to 8 ordered middle frames |
| Elements references | Up to 10 images, 5 videos and 3 audio files (15 files in total) |
| Visual DNA | Up to 10 characters or products per generation |
| Video edit | One source clip plus optional reference images |
| Video extend | 3 to 30 new seconds, with an optional target end image |
| Prompt length | Up to 26,000 characters |
Kling 4.0 runs on ordinary Kolbo.AI credits and is not part of the Unlimited plans.
The five ways to start a Kling 4.0 video
1. Text to video
Write the subject, the setting, one clear action, the camera move and the sound you want to hear. Pick a duration from 3 to 30 seconds, a resolution and an aspect ratio. The 21:9 ratio is there for ultrawide, letterboxed shots.
A good text prompt reads like a shot description, not a list of adjectives: "A cyclist rides through a rain-soaked alley at night, slow tracking shot from the side, neon reflections on the wet ground, tires hissing on the water, distant traffic".
2. Image to video and first and last frames
Start from an image and describe what should move and what should hold still. Switch to first and last frame when you know where the shot must end: upload the opening frame, the closing frame, and Kling 4.0 builds the motion between them. If you are new to this way of working, our first and last frame guide explains how to plan the two frames.
3. Ordered middle frames
This is the most distinctive Kling 4.0 control in Kolbo.AI. In first and last frame mode, an Ordered middle frames row appears under the frames. You can add up to 8 images there, and they play in the order you set, between the first and the last frame. Each frame has arrows to move it earlier or later and a button to remove it.
Use it to direct a sequence beat by beat: a character walks to a door, opens it, steps into a bright room, turns to camera. Each middle frame is one of those beats. Describe the action between them in the prompt so the motion has a reason to travel from one frame to the next.
4. Elements: references to video
Elements lets you combine references with your prompt. Kling 4.0 accepts up to 10 images, 5 videos and 3 audio files in one generation, 15 files in total. Audio references must be 5 to 30 seconds long. You can also attach up to 10 Visual DNA entries, so a recurring character or product keeps the same look across clips. Our Visual DNA guide shows how to build one.
Tag each reference in the prompt and say what it contributes: "@Image1 is the character, @Video1 sets the camera movement, @Audio1 is the music bed". An untagged reference gives the model nothing to work with. For the general workflow, see the Elements guide.
In the app you see one Kling 4.0 choice in Elements. When your references include a video, Kolbo.AI switches to the video reference rate automatically before anything is charged, and the quote waits until the length of every video is known.
5. Video edit and video extend
Edit takes one existing clip and a text instruction, with optional reference images to show the target look. Name exactly what changes: the jacket turns red leather, the street becomes snow-covered, the sky turns to dusk. Say what must stay, too. You can keep the source sound or generate new synchronized audio.
Extend continues a clip from its final frame. Describe what happens next instead of retelling the scene. You choose 3 to 30 new seconds, and you can attach an optional end image so the continuation lands on a specific frame. The result contains the original clip followed by the continuation, and only the new seconds are billed. The aspect ratio follows the source clip.
How to make your first Kling 4.0 video
- Open Kolbo.AI and go to Video tools.
- Pick the mode: text to video, image to video, first and last frame, Elements, or a video edit or extend tool.
- Select Kling 4.0 (or Kling 4.0 Flash for a fast 720p draft).
- Add your inputs: start image, first and last frames, ordered middle frames, or tagged references.
- Write one clear action, the camera move and the sound.
- Set duration, resolution and aspect ratio, then check the credit quote on the Generate button.
- Generate, review picture and sound together, and extend or edit the result if it needs more.
Kling 4.0 vs Kling 4.0 Flash
Kling 4.0 Flash is the fast version of Kling 4.0. It covers four of the tools, at 720p and up to 20 seconds, and it costs about half as much per second. The full model adds 1080p, 30 second clips, frames, audio references and extend.
| Kling 4.0 | Kling 4.0 Flash | |
|---|---|---|
| Best for | Final shots, long takes, directed sequences | Fast drafts and iteration |
| Clip length | 3 to 30 seconds | 3 to 20 seconds |
| Resolution | 720p and 1080p | 720p |
| Aspect ratios | 16:9, 9:16, 1:1, 21:9 | 16:9, 9:16, 1:1, 21:9 |
| Native audio | Yes, on by default | Yes, stereo, always on |
| Text to video | Yes | Yes |
| Image to video | Yes, with first and last frame | Yes, start frame only |
| Ordered middle frames | Up to 8 | No |
| Elements references | 10 images, 5 videos, 3 audio | 10 images, 5 videos, no audio |
| Visual DNA | Up to 10 | Up to 10 in Elements |
| Video edit | Yes, source plus reference images | Yes, 3 to 20 second source plus up to 10 reference images |
| Video extend | Yes, 3 to 30 new seconds | No |
| Credits per second, text or image | 30 at 720p, 44 at 1080p | 15.1 at 720p |
A practical routine: draft the idea with Flash until the framing, the action and the sound are right, then render the keeper with Kling 4.0 at 1080p, or with frames when the shot needs a precise path. The Kling 4.0 Flash launch post shows each Flash tool with its prompt and inputs.
How credits are counted
The quote on the Generate button is always the price you pay, and it updates with every change to duration, resolution and references. At the time of writing, these are the rates:
- Text, image, frames, and Elements without video references: 30 credits per second at 720p, 44 at 1080p.
- Elements with video references, and video edit: 18 credits per billable second at 720p, 27 at 1080p. Billable seconds are the output length plus the larger of the output length or the total reference video length, rounded up.
- Extend: 30 credits per new second at 720p, 44 at 1080p. The source clip is not billed.
- Kling 4.0 Flash: 15.1 credits per second. With video inputs, 10.1 credits per billed second, counted the same way as above.
Two worked examples: a 3 second 720p text to video clip costs 90 credits. A 3 second 1080p Elements clip with 7 seconds of reference video bills 3 + 7 = 10 seconds at 27 credits, so 270 credits. For current plan prices and what a credit buys, see pricing facts and our explainer on how we calculate AI video cost.
Prompting tips that work with Kling 4.0
- One action per clip, even at 30 seconds. For a longer clip, write the action as a short sequence of beats in order, and use middle frames when the order matters.
- Name the camera. Locked, slow push in, tracking from the side, orbit. A clear camera direction steadies the whole clip.
- Put the sound in the prompt. Audio is generated with the picture, so describe footsteps, rain, crowd noise or music.
- For edits, name the object and the material. "Change the car to matte black" beats "make it cooler".
- For extends, write only what happens next. The model already has the last frame.
- Tag every reference. @Image1, @Video1 and @Audio1 should each have a job in the prompt.
For the wider Kling family, including Kling 3.0, Kling O3 and Motion Control, see the Kling model page and the Kling AI video guide.
FAQ
What is Kling 4.0?
Kling 4.0 is the latest Kling video model, available in Kolbo.AI. It makes 3 to 30 second clips at 720p or 1080p with native audio, from text, images, first and last frames with ordered middle frames, or image, video and audio references. It can also edit and extend clips.
How long can a Kling 4.0 video be?
Each generation runs from 3 to 30 seconds. Extend adds another 3 to 30 seconds to an existing clip, and the result includes the source followed by the new part.
What is the difference between Kling 4.0 and Kling 4.0 Flash?
Flash is the fast, lower cost version: 720p, 3 to 20 seconds, text, image, Elements and video to video. Kling 4.0 adds 1080p, clips up to 30 seconds, first and last frames, up to 8 ordered middle frames, audio references and extend.
What are ordered middle frames in Kling 4.0?
In first and last frame mode you can add up to 8 images that play in the order you set between the first and last frame. You can move each one earlier or later, which lets you direct a shot beat by beat.
Does Kling 4.0 generate sound?
Yes. Native audio is generated with the video and is on by default at no extra charge. You can also guide the sound with up to 3 audio references in Elements, and in video edit you can keep the source sound or generate new audio.
How many references can Kling 4.0 use?
Up to 10 images, 5 videos and 3 audio files, 15 files in total, plus up to 10 Visual DNA entries for consistent characters and products.
Is Kling 4.0 included in Unlimited plans?
No. Kling 4.0 uses ordinary Kolbo.AI credits, and the quote is shown before you generate.
Kling 4.0 and Kling 4.0 Flash are live now. Open Kling 4.0 in Kolbo.AI and start with a prompt that names the action, the camera and the sound.