When to choose Kling 4.0 and when Kling 2.5 Turbo Pro
Kling 4.0
Maximum duration: 30 s vs 10 s for Kling 2.5 Turbo Pro
Generation modes: from text / from first and last frames / from references vs from text / from first frame for Kling 2.5 Turbo Pro
Last frame: Yes vs No for Kling 2.5 Turbo Pro
Input photos: up to 8 vs No for Kling 2.5 Turbo Pro
Kling 2.5 Turbo Pro
The table shows no measurable edge for Kling 2.5 Turbo Pro: judge it by the result on your own scene.
Key differences
Kling 4.0: A clip of up to 30 seconds from text and references or from a chain of keyframes: named characters, voice samples and exact frames.
Kling 2.5 Turbo Pro: One subject, one action, one short clip, from text or a starting image.
Specifications
Spec
Kling 4.0
Kling 2.5 Turbo Pro
Model variants
Reference / Keyframes
Turbo Pro
Generation modes
from text / from first and last frames / from references
from text / from first frame
First frame
Yes
Yes
Last frame
Yes
No
Input photos
up to 8
No
Input videos
up to 5
No
Input audio files
up to 3
No
Input video length
2–30 s
No
Minimum duration
3 s
5 s
Maximum duration
30 s
10 s
Resolutions
720p / 1080p
No separate selector
Aspect ratios
9:16 / 16:9 / 1:1 / auto / 21:9
9:16 / 16:9 / 1:1
Prompt limit
8,000 characters
2,500 characters
Price (different settings)
101 coins · 5 s · 720p
34 coins · 5 s · No separate selector
There is no shared resolution for a direct price comparison, so each price includes its setting and is not highlighted as cheaper.
What to compare visually
For a fair A/B test, use the same scene and, where both modes allow it, the same first frame. Inspect motion continuity, character and object consistency, physics and contacts, camera behavior, temporal deformation, in-clip cuts and audio synchronization.
What to inspect with Kling 4.0
A clip of up to 30 seconds from text and references or from a chain of keyframes: named characters, voice samples and exact frames.
Text and references: up to 10 reference photos and 5 videos, up to 7 characters (2–4 photos or one 3–8 second video clip each) and up to 3 voice samples. The Video sound switch applies only to reference videos.
Keyframes: a first frame, a last frame and up to 8 middle frames. The total number of frames depends on the duration and never exceeds 10.
The modes do not mix: Keyframes accepts no video, and characters and voices belong only to Text and references mode.
A hero photo must be at least 300 pixels on the short side; a video character needs at least 700 pixels and one continuous shot.
What to inspect with Kling 2.5 Turbo Pro
One subject, one action, one short clip, from text or a starting image.
Generate from a description or one opening image.
Choose 5 or 10 seconds. There is no separate ending image here.
Only one input image; separate character references cannot be supplied as a set.
Turbo does not promise a fixed waiting time. Service load also affects processing.
How to run a fair comparison
Fix the scene, the first frame (if both models accept one), the duration and the resolution.
Judge motion, not stills: faces, hands and objects should hold across the whole clip and at cuts.
If sound matters, listen to it separately: dialogue, effects and lip sync differ between models.
Price a finished clip, not a second: the per-second rate times your real duration, rounded up once.
Sources
Prices, availability and specifications come from the Mixer AI catalog. This is not an independent test: try both models on the same task before choosing.
Which is cheaper: Kling 4.0 or Kling 2.5 Turbo Pro?
Kling 4.0: 101 coins · 5 s · 720p. Kling 2.5 Turbo Pro: 34 coins · 5 s · No separate selector. The models use different settings, so a direct price comparison would be misleading: compare for the mode you need.
How does Kling 4.0 differ from Kling 2.5 Turbo Pro?
Kling 4.0 — maximum duration: 30 s; last frame: Yes; input photos: up to 8.
How should I compare Kling 4.0 and Kling 2.5 Turbo Pro fairly?
Fix the scene, first frame, duration and resolution. Watch the motion across the whole clip and listen to the sound separately. Price the finished clip, not one second.
Are both models available in Mixer AI?
Yes. Both models are in the Mixer AI video catalog; the launch button on the page opens Canvas on a computer and the Studio on a phone. The page exists only for models in the current catalog.
Which model is better?
There is no single winner. First rule out the model that lacks the duration, first or last frame, sound or resolution you need, then compare clips on your own scene. The table highlights only measurable differences.
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