Choose your video’s frame first, then confirm the exact AI model and generation mode support it. After that, select a resolution and duration combination the model actually offers. These settings vary by model and mode, and some higher-resolution outputs are available only at specific durations.
1. Choose the aspect ratio for the finished video
Decide where the video will appear and how its subject should be framed before you generate it. Landscape 16:9 suits a wide composition; portrait 9:16 gives a vertical frame. A square or other ratio may be appropriate for a particular composition or destination, but the available choices depend on the model and whether you are generating from text or an image.
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Do not assume that a ratio supported in one mode is supported in another. For example, Runway Gen-4.5 lists more ratios for image-to-video than for text-to-video. Check the current settings for the precise model and mode before preparing an image input.
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2. Check the model’s resolution and duration options
Resolution and duration are model settings, not universal AI-video standards. The examples below are published service specifications checked on October 7, 2026; they describe available configurations, not comparative output quality.
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| Model and mode | Aspect ratio and dimensions | Resolution and duration |
|---|---|---|
| Google Veo 3.1 API | 16:9 and 9:16 | 720p default; 1080p and 4K are available only for 8-second videos 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 | Durations listed: 4, 8, or 12 seconds. A resolution tier is not stated in the API reference. |
Sources: Google Veo API documentation, Runway Gen-4.5 documentation, and OpenAI video API reference. Availability and configuration details can change; consult the live documentation for the model you plan to use.
Resolution is not the same as upscaling
Runway Gen-4.5 documents 720p output. Runway’s general resolution 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 output-processing step, not evidence that the model generated native detail at the enlarged size. Google Veo 3.1 lists 720p, with 1080p and 4K available only for 8-second videos on applicable variants.
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Sources: Runway resolution help and Google Veo API documentation.
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Start with the action the shot needs to show, then choose a supported length. A brief, single action is easier to fit into a short clip than a sequence with several beats. This is a pacing guideline, not a claim that one duration or tool produces better results.
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- Runway Gen-4.5: 2–10 seconds.
- Google Veo 3.1: 4, 6, or 8 seconds; the documented 1080p and 4K options are limited to 8 seconds on applicable variants.
- OpenAI Sora 2 API: 4, 8, or 12 seconds.
Sources: Runway Gen-4.5 documentation, Google Veo API documentation, and OpenAI video API reference.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.4. Check what happens to an image that does not match
If you are using image-to-video, compare the source image’s framing with the requested output ratio before generating. Runway’s API documentation says an input that does not match the requested ratio may be center-cropped. That can cut off a subject near an edge. Other models may handle a mismatch differently, so do not assume Runway’s behavior applies across services.
Source: Runway API documentation.
5. Use a settings checklist before generation
- Destination and composition: Decide whether the finished frame should be landscape, portrait, square, or another shape.
- Exact model and mode: Verify the ratio list for text-to-video or image-to-video; do not transfer settings from an older model or a different mode.
- Input framing: Check whether a mismatched image will be cropped or otherwise adjusted, and keep important details away from vulnerable edges.
- Resolution: Select an actual model output option. Treat any later upscale as processing rather than native generation at that size.
- Duration constraints: Confirm both the available lengths and whether a higher resolution is restricted to one of them.
- Delivery requirements: These model specifications do not establish the current publishing requirements of every social platform or destination. Verify the destination’s official guidance separately.
Compare published settings rather than assuming one service is better: the specifications above do not rank video quality.
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