AI video generator for TikTok: which Sume models make 9:16
Six Sume video models list 9:16 and one never takes an aspect ratio. Table of ratios, seconds and resolutions, read from the catalog on 2026-10-07.
TikTok is a vertical format, so the first filter on any video model is whether it can output 9:16. On Sume, send aspect_ratio on POST /v1/videos and check the catalog with GET /v1/videos/models, which lists supported_aspect_ratios per model.
Vertical support by model
Limits are from the Sume catalog docs and the router constraints on 2026-10-07.
| Model | Seconds | Resolutions | 9:16 |
|---|---|---|---|
| seedance-2.5 | 4-30 | 480p / 720p / 1080p | yes |
| seedance-2, 2-fast, 2-mini | 4-15 | 480p / 720p / 1080p | yes |
| wan-3.0 | 2-30 | 480p / 720p / 1080p | yes |
| kling-3 | 4-15 | 720p / 1080p | yes |
| gemini-omni-flash-1.1 (sume/auto) | 3-10 | 360p / 720p / 1080p / 4K | yes (16:9 or 9:16 only) |
| grok-imagine-video-1.5 | 4-15 | 480p / 720p | no aspect_ratio field; image-to-video only |
Two cases to handle
Grok takes a still and no aspect_ratio, so the frame you send is the thing you control. For a TikTok-shaped result send a vertical image. The MiniMax H3 models take 5 to 15 seconds; check supported_aspect_ratios in the catalog before relying on vertical output, as I did not verify it.
Length
Sociality.io reports TikTok in-app recording up to 10 minutes and uploads up to 60 minutes. Any single AI job on Sume is at most 30 seconds, so a full-length video is built from several jobs and joined.
Sources
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Written by Sume