AI movie models: Kling

AI movie models, episode 1. Next: Gemini Omni vs Utopai X, then xAI Grok Imagine.

This series explains one or two AI video models per post, using the same twelve questions every time so the episodes compare. Everything below comes from the vendor’s own pages unless it is marked as a user report or as our opinion. Prices and availability were checked on 21 October 2026 and rechecked on 22 October.

Kling is made by Kuaishou, the Chinese short-video company. The current model is Kling 4.0, which Kuaishou opened to all users on 15 October 2026 after a closed beta for its faster sibling, Kling 4.0 Flash (our beta story, and our general-availability story). New to the topic? Start with how AI video generation works.

What it does differently. Kling’s pitch is length and control in a single generation. Kling 4.0 makes one continuous clip of 3 to 30 seconds without stitching, takes up to 15 reference inputs at once (images, videos, saved “elements” and voice profiles) and can edit a video you already have by instruction. Kling calls it a native multimodal model; that is the vendor’s description, not something we have tested.

What is live and what is “coming soon” (checked 21 October 2026). Kling’s own pages disagree with each other. The feature page says native 4K and 1080p output are “coming soon” and marks 10-bit HDR as coming soon, while its FAQ also says the model “supports” output up to 4K. The user guide (14 October) lists 720p, 1080p and 4K in its spec table, but its own text says 4K/1080p with 10-bit HDR is “coming soon”, and it warns that features are “subject to the actual product interface”. Kuaishou’s release says Kling 4.0 “will also support” 4K, 1080p and 21:9, and that extension to 2 minutes is coming “soon”. Kling’s API capability map (updated 20 October) lists 720P, 1080P and 4K for Kling 4.0, but its price table has no 4K rate and the feature page still said “coming soon” on 22 October. We therefore treat 1080p, 4K, 10-bit HDR, 21:9 and the 2-minute extension as coming soon. Some users report rendering at 1080p already (see below); we have not confirmed that.

Kling 4.0 against the checklist

1. Resolution. 720p is the one resolution no official page marks as coming soon. 1080p and 4K: coming soon per the feature page (see the box). Kling’s API price table now lists a 1080p rate for Kling 4.0 and its API capability map lists 1080P and 4K, but neither shows those renders are live, and the price table has no 4K rate. Kling 4.0 Flash tops out at 720p (user guide FAQ).

2. Aspect ratios. The feature page says 21:9 ultrawide is supported but the same page and Kuaishou’s release group it with the coming-soon formats. The full list of live ratios is not published on the pages we read.

3. Reference types. Images, videos, “elements” (saved subjects, including video elements built from a 3 to 8 second source clip) and voice profiles from a 5 to 30 second audio sample (user guide). Keyframes are a separate mode: you can set up to 10 keyframes, but keyframes and Omni Reference cannot be combined in one task (user guide). Flash has no start/last frame or multiple keyframes (user guide FAQ).

4. How many at once. Up to 15 reference inputs in total: up to 10 images (30 MB each, ratios 2:5 to 5:2), up to 5 videos (3 to 30 seconds each, 30 seconds combined), up to 7 elements (at most 3 of them video elements) and up to 3 voice profiles (user guide).

5. Price (checked 21 October). Kling 4.0 now has a published API price. Kling’s API price table lists Kling 4.0 at “1.0 Unit ($0.157) /s” at 720p and “1.5 Units ($0.235) /s” at 1080p with no input video, and no 4K price. With an input video the rate is $0.094 or $0.141 a second, but Kling bills twice the output length (or input plus output, if the input is longer), so a short reference costs about $0.188 a second at 720p. At the 720p rate a 5 second clip is about $0.79, a 10 second clip about $1.57 and a 30 second take about $4.71 (our arithmetic). Kling says the Kling 4.0 API is “officially rolling out now” (21 October), but its API changelog still had no Kling 4.0 entry on 22 October and the API docs index still listed 3.0 endpoints only, so access may not reach every account at once (our API price story). Kling’s account also says 4.0 is now in Adobe Firefly; partner apps set their own prices. For context, the Kling 3.0 API costs $0.084 to $0.168 per second at 720p/1080p on the same table. On kling.ai itself, the plan list (from its llms.txt, which still describes 3.0 as the latest model) shows Standard at $8.80 a month (660 credits; $6.99 first month), Pro at $32.56 (3,000 credits) and Premier at $80.96 (8,000 credits); credit top-ups start at $5 for 330 credits. The free Basic tier is for personal, non-commercial use. Kling has not published how many app credits a Kling 4.0 second costs. User reports put a 30-second Kling 4.0 clip at 450 credits (@MrPerry1973) and a 15-second 1080p clip at 202 credits (@AI__TSUBAKI); those are user figures, not Kling’s.

6. Performance. Generation time: not published. Kling says Flash is “significantly faster” without a number. Kling 4.0 is not yet on the Artificial Analysis text-to-video leaderboard (checked 21 October); Kling 3.0 Omni 1080p Pro sits at #16 (Elo 1020) there.

7. Character consistency. Done with references: up to 7 saved elements plus up to 10 images let you pin a person, outfit or product across clips, and voice profiles keep a voice (user guide). Kling claims identity holds across a 30-second take; that is its claim.

8. Scene consistency. The single 30-second pass is the main tool: one take means no stitch seams. The user guide says multi-shot is “enabled by default”, with the model splitting shots itself. Extension up to 2 minutes is coming soon (Kuaishou). Targeted editing of an existing clip (swap a subject, change a season) is on the feature page.

9. Compared with the previous model. Against Kling 3.0, Kling 4.0 extends single-pass clips to 30 seconds and adds Omni Reference with video and voice inputs, keyframes and instruction editing, and accepts prompts up to 8,000 tokens (user guide, Kuaishou release). Quality improvements are Kling’s claims.

10. What users think (user reports, not facts).

• Praise: @PromptSin preferred Kling 4.0 over Seedance 2.5 on a dogfight prompt at 720p, saying it “nails the opening frame”. @AngelNwoha found it better than Seedance 2.5 on camera moves and lip sync, with “still some glitches”. @HBCoop_ found its multi-shot scene “more believable” than Kling 3.0’s. A DEV review said a long action take “held together better than I expected”.
• Complaints: @Hailey4AI found Kling 4.0 kept a spoken line’s wording but “slurred the middle of the line”. @zara96ai was “very disappointed” on launch day. The same DEV review called complex choreography “still a high-variance use case”.

11. General quality. We have not generated Kling clips yet. Reviews above point to stable camera moves and long takes as strengths, with dialogue clarity and complex action as weak spots. Kling’s own feature page is its official example gallery.

12. Our verdict (opinion). Pick Kling 4.0 if you need long single takes, or a character, product and voice held across a clip from references. Skip it, for now, if you need confirmed 4K or 1080p delivery, or a fully documented API: the 4.0 API price is out, but Kling’s API changelog and endpoint list did not include 4.0 yet on 22 October.

Rights and licensing

Under Kling’s terms (last updated 21 April 2026) you own your content (§4.4) but grant Kling a licence to it (§4.7.1), must label AI content where required (§4.5), and §4.6 bars commercial use of output without Kling’s written permission. Kling’s plan list says paid tiers allow commercial use; the terms and the plan list conflict, so get the permission in writing before a paid job. Output carries an invisible watermark that Kling says follows standards such as C2PA, and Kling runs a detector. No open weights.

Summary

#	Checklist	Kling 4.0 (21 Oct 2026)
1	Resolution	720p; 1080p and 4K coming soon; Flash max 720p
2	Aspect ratios	live list not published; 21:9 coming soon
3	Reference types	image, video, element, voice; keyframes as separate mode
4	References at once	15 total: 10 images, 5 videos, 7 elements, 3 voices
5	Price	API $0.157/s 720p, $0.235/s 1080p, no 4K; API rolling out; plans from $8.80/mo
6	Performance	time not published; not yet on AA (3.0 Omni #16)
7	Character consistency	elements, images, voice profiles
8	Scene consistency	30 s single take, auto multi-shot; 2 min extension coming soon
9	vs Kling 3.0	30 s single pass, video and voice references, editing
10	Users	long takes and camera praised; dialogue and action glitches
11	Quality	not tested by us; see reviews
12	Verdict (opinion)	best for long, reference-driven takes