Best AI Video Editing Model: Kling 4.0 Edit vs FLUX 3 Video Edit vs Seedance 2.5 Edit vs P Video Edit

Picking the best AI video editing model is harder than picking a text-to-video model, because an editor has two jobs at once. It has to make the change you asked for, and it has to leave everything else alone. Most comparisons only judge the first job. I wanted to measure both, so I ran one clip through five edits on four models: Kling 4.0 Video Edit, FLUX 3 Video Edit, Seedance 2.5 Edit and Pruna P Video Edit.

That came to 20 API calls on Segmind, every one of which returned a video, for $16.92 in total. Below are the side-by-side outputs, what each model actually returns (resolution, frame rate, length, audio), what each edit cost to the cent, and which model I would reach for by job. I also pulled frames and measured how much of the untouched picture survived each edit, so the verdicts rest on more than my eye.

The verdict: the best AI video editing model for each job

If you only read one line: FLUX 3 Video Edit is the best default. It won two of the five edits outright, was the fastest (41 to 56 seconds), and was the cheapest at $0.2574 for a 6 second edit. It also kept my original soundtrack bit for bit. Use Kling 4.0 when the edit involves lettering or a bold creative restyle. P Video is the budget pick if you can live with 480p output. Seedance 2.5 Edit is careful and dependable, but it cost the most and it quietly shortens your clip.

The test: one source clip, five edits, the same prompt everywhere

I needed a source clip that all four models would accept. Their limits differ. Kling wants 3 to 30 seconds with at least 700 pixels on every side. FLUX 3 and P Video stop at 15 seconds. Seedance 2.5 Edit needs at least 4 seconds and refuses real human faces. A 6 second, 1280x720, 24 fps clip with no people satisfies all four. I generated one with Seedance 2.0 Mini: a golden retriever trotting past a blue-doored cafe while the camera tracks sideways. It gives each editor a moving subject, a busy facade, street furniture to remove and a wall to write on.

I trimmed the clip to exactly 6.00 seconds and normalised its audio to about -21.8 LUFS so that I could tell later whether a model kept my soundtrack or wrote its own. Every model got the same prompt, word for word. The only addition was "In @Video 1:" at the front of the Seedance prompts, because that is how its docs say to refer to the source. I ran each edit once with no cherry-picking, so what you see below is the first take from every model.

Edit 1: subject swap, dog to red fox

Swapping the subject is the edit most teams want first: a different product, a different mascot, the same take. The test is whether the new subject inherits the original motion, and whether the rest of the frame is left alone.

Full-resolution files, with audio: Kling 4.0 · FLUX 3 · Seedance 2.5 · P Video

FLUX 3 wins this one clearly. Its fox is the textbook version, with rust-orange fur, black legs and a white tail tip, and it trots with the retriever's exact stride. The facade is close to untouched: comparing the top third of the frame against the source, FLUX scored a structural similarity (SSIM) of 0.93, the highest I measured. P Video came second. Its fox is convincing, if a little soft, which is mostly down to the 848x480 output covered later. Seedance produced a leaner, greyer, more naturalistic fox, and the scene held well.

Kling's animal reads as a coyote or a jackal rather than a red fox: brown-grey, with a darker coat. The background looks right at a glance, but Kling re-renders the entire frame instead of editing in place. Its full-frame SSIM was 0.65, against 0.84 for FLUX. The walls, windows and cobbles are all subtly redrawn. For a social post nobody will notice. For a shot that has to cut back against the original plate, they will.

Edit 2: adding on-screen text to a moving wall

This is the hardest edit in the set. The wall scrolls past as the camera tracks, so the lettering has to stay fixed to the wall, stay in perspective and stay spelled correctly for six seconds.

Full-resolution files, with audio: Kling 4.0 · FLUX 3 · Seedance 2.5 · P Video

Kling 4.0 is the only model that produced readable copy all the way through. Its gold serif BLUE DOOR BAKERY sits cleanly on the wall and tracks with it. But because the facade keeps scrolling, Kling kept writing, and the wall ends up reading BLUE DOOR BAKERY BAKERY. Brief it with where the text should start and stop.

FLUX 3 got BLUE DOOR crisp and correctly placed, but pushed BAKERY so high that the letters are squashed against the top of the frame and partly cut off. Seedance rendered a faded BLUE DOOR at the very top edge, and BAKERY only appears in pieces. P Video did something different: it put small lettering inside the glass transom over the first door, and the spelling drifts between BLOR BAKERY and BLOR DOOR as the shot moves. If text is your use case, this edit alone decides it: Kling, then FLUX.

Edit 3: removing objects from a tracking shot

Clean plates are bread and butter for production teams: a stray sign, a crew bag, a competitor's bike. I asked each model to remove both black lampposts and the red bicycle, which only appears in the final second of the clip.

Full-resolution files, with audio: Kling 4.0 · FLUX 3 · Seedance 2.5 · P Video

Seedance 2.5 and P Video tie for first. Both removed every lamppost and the bicycle, filled the wall and pavement convincingly, and kept the wall lanterns, which I had not asked them to touch. P Video does it for one sixth of Seedance's price, at lower resolution.

FLUX 3 removed the first lamppost and the bike cleanly, but left the second lamppost standing in the last second. That is an easy miss to overlook in review, which is exactly why it matters. Kling 4.0 removed everything and then kept going. Its version starts further along the facade than the source, and the side street at the end becomes a flat yellow wall. Every object is gone, but the location has changed. Its full-frame SSIM of 0.58 was the lowest of any local edit in the test.

Edit 4: changing the weather and time of day

Relighting a whole scene is where an editor has to change almost every pixel while still keeping the geometry. Midday sun becomes a snowy blue evening, and the lights have to come on.

Full-resolution files, with audio: Kling 4.0 · FLUX 3 · Seedance 2.5 · P Video

FLUX 3 committed fully, and it is the best result here. The whole frame drops into a blue dusk, the wall lanterns and windows glow warm, snow sits on the window boxes and the pavement, and there is even snow on the dog's back, with the dog relit to match. Seedance was a solid second: snow on the ground and on the geraniums, a darker, cooler dog, and lit lanterns, though the grade is less blue than I asked for.

Kling gave the cafe gorgeous warm interiors and frosted window boxes, but the dog and facade still look as if they are lit by afternoon sun, so the shot reads as dusk indoors and daytime outdoors. P Video only half did it. It lit the lanterns and dimmed the wall near the cafe, and dusted the flowers, but the pavement and sky stayed in daylight. None of the four gave me a convincing curtain of falling snow, so I would not rely on any of them for that part of the brief.

Edit 5: restyling the whole clip as watercolour

A full restyle tests the opposite skill: change everything about the look while keeping the composition and motion locked, so the result still cuts against the original edit.

Full-resolution files, with audio: Kling 4.0 · FLUX 3 · Seedance 2.5 · P Video

P Video matched the brief most closely: soft colour washes, loose ink outlines on the dog and the windows, and the framing and camera path held exactly. Kling painted the most beautiful frame of the test, with rich pigment and pooled colour on the cobbles. But it pulled the camera back and up, shrank the dog, and brought the bicycle into view more than a second early. It broke my "keep the camera move" instruction outright, so it is a better fit for a standalone art piece than for a shot in a timeline.

FLUX 3 kept the composition perfectly and looks more like a watercolour filter than a painting. It also drained the red from the bicycle. Seedance was the most conservative: painterly texture on the walls, with the dog still close to photoreal.

What the spec sheets do not tell you

I probed every output file. These are the differences that will bite you in production, and none of them are obvious from the model pages.

Audio is the biggest hidden difference. I correlated each output's audio against my source. FLUX 3 and P Video returned my soundtrack bit for bit, a correlation of 1.00 on all ten files. Kling and Seedance threw it away and generated a new one, with a correlation near zero. Kling's new track came back at 44.1 kHz and Seedance's at 32 kHz, against my 48 kHz source. For Kling that is expected. For Seedance it contradicts its own docs, which say generate_audio true "keeps the clip's soundtrack". If your clip has dialogue or licensed music, use FLUX or P Video, or plan to lay the original audio back on afterwards.

Seedance 2.5 Edit shortens your clip. The docs promise the output keeps the source's length. Mine came back at 5.71 to 5.73 seconds every time. It does not cut the ending. By matching frames, I found it plays the whole action about 5% faster, so output second 3.0 matches source second 3.15. Anything you cut back against the original will drift out of sync.

P Video Edit returns 848x480 at 25 fps, whatever you send it, and there is no parameter to change that. It is fine for social drafts. For a 1080p timeline you will need an upscale pass. FLUX 3 trims a 720p source slightly, to 1248x704.

What each edit actually cost

The Seedance bill is worth understanding, because it is the one that surprises people. A 720p frame is 900 video tokens. Seedance billed 252,900 tokens per edit, which is exactly 900 x (144 source frames + 137 output frames), at $6.56 per million: $1.659024. You pay for the clip it reads as well as the clip it writes. Because the output came back shorter, the bill was about 3% under the "twice the clip length" estimate in its docs.

Scaled to a minute of edited footage, that is roughly $2.57 on FLUX 3, $2.70 on P Video, $11.96 on Kling at 720p and about $16.59 on Seedance at 720p. A 6.5x price spread between the cheapest and the most expensive model is a bigger lever than any quality difference I found.

Which AI video editor should you use?

Marketing agencies making ad variants: start with FLUX 3 Video Edit. Product, colourway and background swaps are exactly the edits it does best, it keeps your voiceover, and at about $0.26 per 6 second variant you can afford to generate ten and keep two. When the variant hinges on on-screen copy, send that one shot to Kling.

Film and VFX teams doing clean plates and continuity: Seedance 2.5 Edit gave me the tidiest object removal at full 720p, and it exposes a seed parameter (42 by default). Budget for the double billing, and conform the 5% retime before you cut it back in. Avoid Kling for plate work: it redraws the whole frame.

Production houses and MCNs restyling at volume: P Video Edit gave the most faithful restyle and a clean removal for $0.27, and it keeps the creator's audio. Plan for 480p output and wide latency swings (100 to 295 seconds in my run).

Creative and brand work where the look matters more than the plate: Kling 4.0 Video Edit produced the best typography and the most painterly frame. It also offers 1080p and reference images. Just do not expect it to hold your framing.

Run the same comparison through the API

All four models sit behind the same Segmind endpoint shape and the same API key, so a side-by-side is a single loop. This is the exact removal edit from above:

import requests

API_KEY = "YOUR_API_KEY"
SOURCE = "https://segmind-resources.s3.amazonaws.com/blog/video-edit-showdown-source.mp4"
EDIT = "Remove the black iron lampposts and the red bicycle from the street, filling the wall and pavement behind them naturally. Keep the dog, the cafe facade, the camera move and the lighting unchanged."

jobs = {
    "kling-4-video-edit": {"video": SOURCE, "prompt": EDIT,
                           "duration": 6, "resolution": "720p", "aspect_ratio": "adaptive"},
    "flux-3-video-edit":  {"video": SOURCE, "prompt": EDIT},
    "seedance-2.5-edit":  {"video": SOURCE, "prompt": "In @Video 1: " + EDIT,
                           "resolution": "720p", "generate_audio": True, "seed": 42},
    "p-video-edit":       {"video": SOURCE, "prompt": EDIT, "draft": False},
}

for slug, payload in jobs.items():
    r = requests.post(f"https://api.segmind.com/v1/{slug}",
                      headers={"x-api-key": API_KEY}, json=payload, timeout=1800)
    r.raise_for_status()
    with open(f"{slug}.mp4", "wb") as f:
        f.write(r.content)
    print(slug, "billed $" + r.headers.get("x-cost", "?"))

Each call is synchronous and returns the MP4 itself, and the x-cost response header tells you exactly what it billed. For anything longer than a few seconds, use the v2 async endpoint (POST https://api.segmind.com/v2/{slug}, then poll the status URL), because Seedance and P Video edits can run for several minutes.

Limits of this test

This is one source clip and one take per model per edit, so treat the results as a strong signal, not a benchmark. Seedance had a fixed seed. FLUX 3 and Kling expose no seed at all, and P Video's default is random, so a rerun of any of them will differ. My clip has no people, because Seedance refuses real faces, so face and identity preservation went untested, and for many teams that is the edit that matters most. I also kept everything at 720p so that the comparison was fair. Kling and Seedance can go to 1080p, which FLUX 3 and P Video cannot.

FAQ

What is the best AI video editing model in 2026?

In my test, FLUX 3 Video Edit was the best overall: it won two of five edits, was the fastest and cheapest at $0.2574 per 6 second edit, and kept the original audio. Kling 4.0 was best for on-screen text.

Which AI video editor keeps the original audio?

FLUX 3 Video Edit and P Video Edit returned my source audio bit for bit. Kling 4.0 Video Edit and Seedance 2.5 Edit replaced it with a newly generated soundtrack.

How much does AI video editing cost per second?

On Segmind at 720p: FLUX 3 is $0.0429 per output second, P Video $0.045, Kling 4.0 about $0.199, and Seedance 2.5 about $0.276 effective, because it bills the source as well as the output.

Can AI video editors add readable text to video?

Kling 4.0 was the only model that kept BLUE DOOR BAKERY fully legible on a moving wall, though it repeated a word. FLUX 3 got it partly right. Seedance and P Video garbled or clipped it.

Does Seedance 2.5 Edit change the length of my video?

Yes. A 6.00 second source came back at 5.71 to 5.73 seconds, with the action played about 5% faster, not trimmed. Conform it before cutting it against the original.

What resolution does P Video Edit output?

848x480 at 25 fps for a 1280x720 source, with no parameter to change it. Upscale it if it is going into an HD timeline.

The bottom line

No single model won every edit, and that is the useful finding. If you need one default, FLUX 3 Video Edit is the best AI video editing model in this group: fast, cheap, faithful to the untouched frame and to your audio. Send lettering and bold restyles to Kling 4.0, careful plate cleanup to Seedance 2.5 Edit, and high-volume social restyles to P Video Edit. All four run on Segmind with one API key, so you can route each shot to the model that suits it rather than locking into one vendor. Try them on your own footage: FLUX 3 Video Edit, Kling 4.0 Video Edit, Seedance 2.5 Edit and P Video Edit.