Choose an AI video’s frame shape first, then check what the exact model and generation mode support, and only then settle on resolution and duration. These settings are model-specific: one mode may offer several aspect ratios while another offers only one, and higher resolution may be available only for a particular clip length.
1. Choose the frame for the composition and destination
Aspect ratio describes the relationship between a video’s width and height. Decide whether the scene should be landscape, portrait, square, or another shape based on how you want to compose it and where you plan to use it. Making that decision before generation helps avoid discovering that a subject is awkwardly framed or that the generator does not support the intended shape.
Do not assume every model or mode in a service offers the same ratios. Google Veo 3.1 documents 16:9 and 9:16. Runway Gen-4.5 text-to-video documents 16:9, while its image-to-video mode also lists 9:16, 1:1, 4:3, 3:4, and 21:9. Check the options for the precise model and mode you intend to use.
When you start from an image
Check what happens if the source image does not match the requested ratio. Runway’s API documentation says a mismatched input may be center-cropped. That can cut off a person, product, or other important detail near the edge of the image. Preview or prepare the image for the target frame before generating; behavior may differ when using third-party models.
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2. Check the resolution the model actually generates
Resolution settings are not universal, and a larger pixel count is not always selectable. Runway Gen-4.5 documents 720p output. Runway’s general help says generative outputs are 720p and can be upscaled to 4K; its standard generation setting does not expose arbitrary pixel dimensions. Upscaling is a later processing step, not evidence that the model generated native detail at 4K.
Google Veo 3.1 lists 720p, with 1080p and 4K available only for 8-second videos on applicable variants. That makes resolution and duration a linked choice in those configurations: if you need the higher-resolution option, confirm that the relevant variant supports it at your intended clip length.
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3. Choose a duration that fits the action and available settings
Pick a clip length that gives the action enough time to read without asking a short generation to contain too many events. A simple, clearly staged action is easier to fit into a short clip; this is pacing guidance, not a comparative claim about model performance.
Available lengths vary by model. Runway Gen-4.5 supports 2–10 seconds. Google Veo 3.1 documents 4-, 6-, and 8-second generations, with the 1080p and 4K configurations restricted to 8 seconds on applicable variants. OpenAI’s Sora 2 API lists 4-, 8-, or 12-second durations. Verify the current menu for the exact model rather than borrowing settings from another model or an older product version.
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Published settings compared
The following are documented service settings, not independent quality tests or platform publishing requirements. Google’s figures are from its Veo 3.1 API documentation; Runway’s figures are from its Gen-4.5 documentation; and OpenAI’s figures are from its Sora 2 API reference. The documentation was checked on October 7, 2026, and service options can change.
| Model and mode | Documented aspect ratios and dimensions | Resolution and duration |
|---|---|---|
| Google Veo 3.1 API | 16:9 and 9:16; dimensions not stated in the cited API settings | 720p default; 1080p and 4K only at 8 seconds on applicable variants. Documented durations: 4, 6, and 8 seconds. |
| Runway Gen-4.5 text-to-video | 16:9, 1280×720 | 720p; 2–10 seconds. |
| Runway Gen-4.5 image-to-video | 16:9, 1280×720; 9:16, 720×1280; 1:1, 960×960; 4:3, 1104×832; 3:4, 832×1104; 21:9, 1584×672 | 720p; 2–10 seconds; 24 or 25 fps. |
| OpenAI Sora 2 API | 720×1280, 1280×720, 1024×1792, or 1792×1024; corresponding aspect-ratio labels not stated in the cited API reference | Durations listed: 4, 8, or 12 seconds; resolution tier not stated in the cited API reference. |
A quick decision process
- Set the destination and composition. Decide how the video should be framed before generating it.
- Open the exact model and mode’s settings. Confirm its aspect-ratio options, especially if you are using image-to-video.
- Inspect the input framing. Check whether a mismatched image will be cropped or resized, and keep important content inside the expected frame.
- Choose from the available resolution and duration combinations. Look for restrictions that tie higher resolution to a specific clip length.
- Check the destination’s current delivery requirements separately. The model settings above do not establish what a particular social platform or other destination requires.
What to compare when choosing a model
- The aspect ratios supported by the specific generation mode.
- The actual dimensions or resolution tier the model outputs, rather than an upscaling option alone.
- The duration menu and any resolution-duration restrictions.
- How the service handles an input image with a different aspect ratio.
Published settings can tell you whether a model supports the shape, size, and length you need. They do not establish which tool produces the best-looking video; that requires comparative output testing.
Quick Recap
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