Correction, 2026-10-02: we re-audited this page against Meta's own pages and the 8frame tool registry. It said Meta's Advantage+ and creative-testing flows "allocate budget toward what performs" and that Advantage+ "rewards distinct variants". Meta's pages say something narrower: within an ad set, delivery shows each person the ad most likely to get the lowest cost per result; Advantage+ campaign budget spreads one budget across ad sets; and an A/B test splits audiences evenly. The page now quotes them. It offered 1:1 as a route for the Facebook feed, which Meta's feed spec doesn't list (it recommends 4:5); the routes are now a crop from 3:4 or from 9:16. It ranked the models ("the volume engine", Seedance "holds shape and branding") without measuring them, gave Kling's resolution as "not set" (Kling v3 Standard returns 720p, Kling 2.6 Pro 1080p), and priced the 20-variant test only at settings the tools don't open on: the Kling tool starts with sound on (86 per hook), the Veo tool on Veo 3.1 Fast (168) and the Seedance tool on Seedance 2.5 (157). The test is now priced line by line, 1,580 to 2,471 credits, and the page adds Meta's Instagram feed video spec (9:16, 1080 x 1920).
Correction, 2026-10-01: an earlier version said Kling v3 Standard makes 16:9, 9:16 or 1:1 from text. On 8frame, Kling v3 needs a start image and follows its shape; for hooks written as text only, the Kling model is Kling 2.6 Pro (47 credits for 5 silent seconds, 95 with audio). The shapes and the Kling section now say so. The 20-variant budget also left out the start stills Kling v3 needs: with one Nano Banana 2 still per hook it is 1,860 credits, not 1,684.
For Facebook ads in 2026, the useful question is less which model makes the single best clip than what each distinct variant costs. Meta's delivery system chooses which ad in an ad set each person sees, so a test needs several distinct ads, and each one is a generation you pay for. By job: Kling v3 for batches of hooks from a still you choose (86 credits for 5 seconds with sound, as the Kling tool opens, or 57 silent), Seedance when a real product must appear, with up to 9 reference images (108 for 5 seconds at 720p on Seedance 2.0), Veo 3.1 for the occasional hero with sound (168 on Fast, 448 on Standard) and Wan 3.0 for cheap concept tests (24 for 5 seconds at 480p). One catch for the Facebook feed: Meta recommends 4:5, and none of the video models on 8frame offers 4:5.
Correction, 2026-09-30: the first version of this page listed Kling v3 at native 4K 30fps and Veo 3.1 at 4K 60fps (video on 8frame tops out at 1080p, 2K on Hailuo H3; Creatify Boreal, added later, also reaches 2K), gave Seedance and Hailuo as 1080p (480p/720p and 2K), quoted generation times we can't reproduce, said the canvas exports one clip in 9:16, 4:5 and 1:1 (each shape is its own generation, and no video model here offers 4:5), gave placement specs we couldn't source, and pointed to a Facebook ad template that doesn't exist. This version uses Meta's Ads Guide and registry prices.
TL;DR
- Batches of hooks: Kling v3 Standard from a start still, 86 credits for 5 seconds with sound (the default) or 57 silent, plus 11 for a Nano Banana 2 still at 1K
- Product references: Seedance, up to 9 reference images, 108 for 5 seconds at 720p on Seedance 2.0 (157 on Seedance 2.5, the default)
- The hero: Veo 3.1, 8 seconds with audio, 168 on Fast (the default) or 448 on Standard
- Concept and angle tests: Wan 3.0 at 480p, 24 for 5 seconds
- 2K and camera moves: Hailuo H3 at 2K, 88 for 5 seconds
- 4:5 feed: generate 3:4 (Seedance, or Hailuo H3 from text) and crop about 6% of the height, or crop 9:16 (about 30%)
How Meta chooses between your ads
Meta's help page on ad delivery says that if you have several ads in an ad set, "we'll show the ad that's most likely to achieve the lowest cost per optimization event for the given person", so your ads won't necessarily be delivered the same number of times. Advantage+ campaign budget works one level up: one campaign budget "distributed and optimized in real time to find the best opportunities across your ad sets". A structured A/B test is the exception: Meta says it splits audiences evenly so the versions can be compared.
None of that says how many variants to make. It does mean each distinct hook is one more option for delivery to choose from, and each is a generation you pay for. That's the argument behind creative volume, and it makes model choice partly a cost-per-variant decision. The testing mechanics are in the AI ad variant testing workflow.
Placement specs
Facebook Feed (Meta Ads Guide, English): 4:5, 1440 x 1800 recommended, MP4, MOV or GIF, up to 4 GB, 1 second to 241 minutes, H.264 with stereo AAC audio at 128 kbps or more; captions and sound optional, but recommended.
Instagram Feed (Meta Ads Guide, English): 9:16, 1080 x 1920 recommended, 1 second to 60 minutes. The 4:5 recommendation is the Facebook feed's; in Instagram's feed the vertical clip runs as generated.
Vertical Reels placements (Meta's Instagram Reels ad guide): 9:16, 1440 x 2560 recommended, up to 4 GB; keep 14% at the top, 35% at the bottom and 6% at each side free of text and logos, and leave licensed music out.
What that means on 8frame:
- No video model here offers 4:5. Veo makes 16:9 and 9:16; Wan 3.0 and Kling 2.6 Pro add 1:1 from text; Kling v3 follows the shape of its start image; Seedance offers 4:3 and 3:4 too, and so does Hailuo H3 from text. For the Facebook feed, generate 3:4 and crop about 6% of the height, or crop 9:16, which loses about 30% of the height (1080 x 1920 becomes 1080 x 1350) but leaves the uncropped clip for Reels, Stories and the Instagram feed.
- Video tops out at 1080p (2K on Hailuo H3 and Creatify Boreal), below Meta's 1440-pixel recommendation; Kling v3 Standard and Seedance return 720p. Upload the highest resolution you have.
- Each shape you generate is its own generation; a crop isn't. For the winners, a 9:16 master cropped to 4:5 covers the Facebook feed and the vertical placements from one generation; generate 3:4 separately when the crop from 9:16 cuts the subject.
- Plan for viewers with the sound off: Meta lists captions as optional but recommended, so burn them in, and put the hook in the first second.
If aspect ratios are fuzzy, what is aspect ratio covers the geometry; the full feed spec is in Facebook video ad specs.
Model picks by job
None of these picks is a measured ranking; each rests on a price, an input or a resolution you can check.
Kling v3: batches of hooks from one look
Kling v3 Standard runs 3 to 15 seconds and on 8frame starts from an image, whose shape it follows. The Kling tool opens on v3 Standard with sound on: 86 credits for 5 seconds, 57 with sound off. Its files come back at 720p. Budget the start image too: a Nano Banana 2 still at 1K is 11 credits, and one still can serve several hooks that differ only in motion or prompt, so the opening frame stays fixed while the hook changes. For hooks written as text only, Kling 2.6 Pro makes 16:9, 9:16 or 1:1 at 1080p: 47 silent, 95 with audio. Background in what is Kling v3.
Seedance: product references
When a real product has to appear, add its photos as references: up to 9 on Seedance 2.0 and 2.5. Check the label and the shape in every frame before a cut ships; we haven't measured how well either version keeps them. The Seedance tool opens on Seedance 2.5: 157 credits for 5 seconds at 720p (70 at 480p), up to 30 seconds. Seedance 2.0 runs 4 to 15 seconds: 48 for 5 seconds at 480p, 108 at 720p, the same price with or without references. Both stop at 720p, the price is the same with sound, and both offer 3:4 for a 4:5 crop. If the references include a person, frame them waist-up: Seedance rejects close-up face references with an E005 error. See Seedance 2.0 prompts for UGC ads.
Veo 3.1: the hero clip
Sound with the picture, 4, 6 or 8 seconds at 1080p in 16:9 or 9:16. The Veo tool opens on Veo 3.1 Fast, 168 credits for 8 seconds with audio; Veo 3.1 Standard is 448. One hero variant in a testing set, surrounded by cheaper Kling variants. Detail in what is Veo 3.
Hailuo H3: 2K and camera moves
2K, 5 to 15 seconds, 88 credits for 5 seconds; from text it offers six shapes including 3:4, and from a start image it follows the image. For a slow push or orbit on a still, H3 Max Camera Controls is 34 for 5 seconds at 480p. Background in what is Hailuo.
Wan 3.0: cheap concept tests
24, 48 or 95 credits for 5 seconds at 480p, 720p or 1080p; the Wan tool opens at 1080p, so set 480p for tests. Test hooks, scenes and pacing at 480p, drop the losers cheaply, then reproduce the winner on Kling or Seedance. See what is Wan AI.
Pricing math
A credit is $0.01 at pack rate.
| Model | Credits per clip | Resolution | 4:5 route | Facebook job |
|---|---|---|---|---|
| Kling v3 Standard | 86 with sound (the default) / 57 silent (5 s), plus an 11-credit start still | 720p | 9:16 still, then crop | Batches of hooks |
| Kling 2.6 Pro | 47 silent / 95 with audio (5 s) | 1080p | 9:16, then crop | Kling from text |
| Seedance 2.5 | 70 / 157 (5 s, the default) | 480p / 720p | 3:4, then crop | Product references, up to 30 s |
| Seedance 2.0 | 48 / 108 (5 s) | 480p / 720p | 3:4, then crop | Product references |
| Hailuo H3 | 88 (5 s) | 2K | 3:4 from text, then crop | 2K, camera moves |
| Wan 3.0 | 24 / 48 / 95 (5 s) | 480p / 720p / 1080p | 9:16, then crop | Concept tests |
| Veo 3.1 Fast / Standard | 168 / 448 (8 s, audio) | 1080p | 9:16, then crop | Hero |
A 20-variant test, line by line:
- 16 Kling v3 Standard hooks, 5 seconds each: 1,376 with sound on, as the Kling tool opens (16 x 86), or 912 silent (16 x 57).
- 16 Nano Banana 2 start stills at 1K, one per hook: 176 (16 x 11); 44 if four stills serve four hooks each.
- 3 Seedance UGC cuts, 5 seconds at 720p: 471 on Seedance 2.5, where the tool opens (3 x 157), or 324 on Seedance 2.0 (3 x 108).
- 1 Veo 3.1 hero, 8 seconds with audio: 168 on Fast, where the Veo tool opens, or 448 on Standard.
At the tools' defaults that's 2,191 credits (1,376 + 176 + 471 + 168). Silent hooks with Seedance 2.0 and Veo Fast come to 1,580; with a Veo Standard hero instead, 1,860; every line at its higher setting, 2,471. Sharing four stills across the hooks takes 132 off any of these. All of them fit a $49 Creator month (3,000 credits). Regenerating each winner in a second shape adds one clip per winner.
FAQ
What is the best AI video generator for Facebook ads in 2026?
No single model, and no measured ranking: pick by job. Kling v3 for most of a batch of hooks, because each starts from a still you choose and costs 86 credits for 5 seconds with sound (57 silent) plus 11 for the still. Seedance when a real product must appear, with up to 9 reference images. Veo 3.1 for the occasional hero with sound (168 on Fast, 448 on Standard), Wan 3.0 for cheap concept tests (24 at 480p).
What are the Facebook video ad specs?
For Feed, Meta lists 4:5 at 1440 x 1800 recommended, MP4, MOV or GIF up to 4 GB, 1 second to 241 minutes, H.264 with stereo AAC at 128 kbps or more. Instagram feed video is 9:16 at 1080 x 1920. For vertical Reels placements, 9:16 with 14% top, 35% bottom and 6% side margins free of text.
Can AI generate 4:5 video for the Facebook feed?
Not as a setting on 8frame: no video model here offers 4:5. Generate 3:4 on Seedance (or on Hailuo H3 from text) and crop about 6% of the height, or crop a 9:16 clip, which loses about 30% of the height but keeps the uncropped version for Reels and Stories.
How much does a 20-variant Facebook test cost?
1,580 to 2,471 credits for 16 Kling hooks with a start still each, three Seedance UGC cuts and one Veo hero, depending on sound and model versions; 2,191 at the tools' default settings. Sharing four stills across the hooks takes 132 off.
Sources
- Meta Ads Guide, Facebook Feed video, English: 4:5, 1440 x 1800, MP4, MOV or GIF, up to 4 GB, 1 second to 241 minutes, H.264, stereo AAC at 128 kbps or more, captions and sound optional but recommended: facebook.com/business/ads-guide/update/video/facebook-feed?locale=en_US, checked 2026-10-02
- Meta Ads Guide, Instagram feed video, English: 9:16, 1080 x 1920, 1 second to 60 minutes: facebook.com/business/ads-guide/update/video/instagram-feed?locale=en_US, checked 2026-10-02
- Meta Ads Guide, Instagram Reels video, English: 9:16, 1440 x 2560, up to 4 GB, safe zone 14% top, 35% bottom, 6% each side, no licensed music: facebook.com/business/ads-guide/update/video/instagram-reels?locale=en_US, checked 2026-10-02
- Meta Business Help Center, About ad delivery ("we'll show the ad that's most likely to achieve the lowest cost per optimization event for the given person"): facebook.com/business/help/1000688343301256?locale=en_US, checked 2026-10-02
- Meta, Advantage+ campaign budget ("distributed and optimized in real time to find the best opportunities across your ad sets"): facebook.com/business/ads/meta-advantage-plus/budget?locale=en_US, checked 2026-10-02
- Meta Business Help Center, About A/B testing (audiences "evenly split and statistically comparable"): facebook.com/business/help/1738164643098669?locale=en_US, checked 2026-10-02
- 8frame video prices, tool defaults, shapes and reference limits (Kling, Veo, Hailuo, Seedance, Wan): the 8frame tool registry, cost functions and aspect-ratio configuration, read 2026-10-02
- Kling v3 start-image requirement and Kling 2.6 Pro prices (calculateKling26Cost): 8frame video generation code and tool registry, read 2026-10-01
- Nano Banana 2 still at 1K (11 credits) and Kling v3 Standard per-clip prices (calculateKlingV3Cost): 8frame tool registry, read 2026-10-01
- Measured output resolution (Kling v3 Standard 720p, Kling 2.6 Pro 1080p): 8frame production files, 2026-09-30
- Seedance close-up face refusals (E005): 8frame tests on Seedance 2.0 and 2.5 at 480p, August 2026, see Seedance flagged as sensitive (E005)
Running the same creative elsewhere? See best AI video for TikTok, best AI video generator for YouTube Shorts and best AI video for Instagram Reels.
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