Kling 2.1 is the proven mid-generation of Kuaishou’s video family, and on Flux 3 AI it arrives as a four-endpoint lineup: Pro, Standard, and a Master pair split into text-to-video and image-to-video. That spread makes 2.1 the flexible pick — budget takes and premium takes live under one roof.
Each tier has a distinct job. Kling 2.1 Pro is the image-to-video specialist and the only Kling endpoint on the platform with first-and-last-frame keyframes plus negative prompts — bookend a shot with two stills and it animates the journey between them. Standard is the economical all-rounder accepting text or image input, while the Master variants aim at top-shelf detail in either mode.
All four render 5 or 10 second clips at 720p or 1080p; Standard and Master text-to-video add a 1:1 square option beside 16:9 and 9:16. Reference images and style presets are supported on the image-capable endpoints, so a recurring character can survive across an entire batch.
See what's possible on Flux 3 AI
Sample generations from the platform — write your own prompt to see what Kling 2.1 does with it.
Kling 2.1 vs similar AI video models
Specs from the live catalog — every model below is available on the same account.
| Spec | Kling 2.1 | Kling 2.5 Turbo | Kling 3.0 |
|---|---|---|---|
| Max clip length | 10s | 10s | 15s |
| Durations | 5s, 10s | 5s, 10s | 3s, 5s, 10s, 15s |
| Resolutions | 720p · 1080p | 720p · 1080p | 720p · 1080p · 2160p |
| Aspect ratios | 3 | 3 | 3 |
| Audio | |||
| Image to video | |||
| Reference images | up to 1 | up to 1 | up to 1 |
| Keyframes | |||
| Negative prompt |
Capabilities reflect what each model supports on Flux 3 AI today.
What makes Kling 2.1 stand out
First & last frame
Kling 2.1 Pro interpolates between two stills you supply — plan transitions, reveals, and product turns shot by shot.
Three quality tiers
Standard for volume, Pro for controlled image-to-video, Master for maximum detail — pick per shot, not per project.
Cleanup via negatives
The Pro endpoint takes negative prompts, letting you veto artifacts and off-brief elements before rendering.
Both input modes
Master ships as separate text-to-video and image-to-video variants, and Standard handles either from one endpoint.
Consistent subjects
Reference-image support on the image endpoints keeps a face or product steady across a multi-clip series.
Popular use cases
Why creators run Kling 2.1 on Flux 3 AI
- Pick Pro, Standard, or Master per shot while billing stays on one Flux 3 AI balance.
- The built-in prompt-enhance tool sharpens a brief before you spend a single 2.1 credit.
- Run identical prompts on Kling 2.1 and Seedance to judge which fits your project.
Kling 2.1 specs & capabilities
Output
- Clip duration5, 10 seconds
- Resolutions720p · 1080p
- Aspect ratios16:9 · 9:16 · 1:1
- Generation modesText to Video · Image to Video
Controls
- Image to video (start frame)
- Reference images
- First & last frame keyframes
- Audio generation
- Negative prompt
- Video input / editing
- Extend video
Available versions on Flux 3 AI
Every Kling 2.1 endpoint below is selectable in the Create studio.
- Kling v2.1 Pro (I2V)Kling 2.1 Pro — image-to-video, first/last frame
- Kling v2.1 StandardKling 2.1 Standard
- Kling v2.1 Master (T2V)Kling 2.1 Master — text-to-video
- Kling v2.1 Master (I2V)Kling 2.1 Master — image-to-video
Kling 2.1 prompt examples
Copy one as a starting point, or send it straight to the Create studio.
“From a closed vintage suitcase to the same suitcase open and overflowing with glowing fireflies — animate the journey between these two frames, dim attic light”
A first-and-last-frame brief for the Pro endpoint.
“A ceramicist shaping a spinning clay bowl on a wheel, hands glistening with slip, close-up on fingers pressing the rim, warm workshop light”
Tests fine hand detail the Standard tier renders well.
“A red fox trotting across a snow-covered field at dawn, breath fogging in the cold air, camera tracking sideways at a distance, pale pink sky”
A Master-tier showcase of fur, snow, and steady tracking.
Create with Kling 2.1 in three steps
Describe your idea
Write a prompt or upload a starting image — the more specific the scene, motion, and style, the better Kling 2.1 performs.
Pick Kling 2.1 & settings
Choose duration, resolution, and aspect ratio. The studio shows the exact credit cost before you generate.
Generate & download
Kling 2.1 renders in the cloud — track progress in your library, then download watermark-free or share with a link.
Kling 2.1 questions, answered
What is Kling 2.1?
Kling 2.1 is a widely used generation of Kuaishou’s Kling video model, available on Flux 3 AI in Pro, Standard, and Master tiers. It produces 5 or 10 second clips at 720p or 1080p from text prompts or images.
What is the difference between Kling 2.1 Pro, Standard, and Master?
Pro focuses on image-to-video with first/last-frame keyframes and negative prompts. Standard is the lower-cost generalist for text or image input. Master splits into dedicated text-to-video and image-to-video variants tuned for the highest 2.1 fidelity.
How do first and last frames work in Kling 2.1?
On the Pro endpoint you upload an opening still and a closing still; the model generates the motion connecting them. It’s the most precise way to control where a Kling shot begins and ends.
Does Kling 2.1 do text-to-video?
Yes — through the Standard endpoint and the Master text-to-video variant. Both render 5 or 10 seconds at up to 1080p in 16:9, 9:16, or 1:1.
Is Kling 2.1 still worth using over newer versions?
Often, yes. Newer Kling releases raise fidelity and length, but 2.1 uniquely offers keyframe bookends on Flux 3 AI, and its Standard tier is a friendly credit price for high-volume drafting.
Can Kling 2.1 keep the same character across clips?
The image-capable endpoints accept a reference image, which anchors a subject’s appearance from generation to generation — useful for episodic content and brand mascots.
How do I try Kling 2.1?
Create a free Flux 3 AI account, open the Create studio, and select a Kling 2.1 tier. Starter credits cover your first generations, and finished clips download watermark-free.