AI video reference limits: how many images and clips per model

Reference limits are the most model-specific part of Sume's video API: Wan 3.0 takes up to 10 reference images and 5 reference videos, MiniMax H3 up to 9 images and 3 videos, Gemini Omni Flash 1.1 up to 10 images and 3 videos of 3 seconds each, and the swap rows take 1 to 8 (Genjutsu) or 1 to 4 (Recast) photos. Kling 3 and Grok Imagine take none.

The table

Fields are reference_image_urls, reference_video_urls and reference_audio_urls on the Video Router, and input_references on /v1/videos.

Odd limits that trip requests

These are the failures seen when a request that worked on one model is replayed on another.

• MiniMax H3 counts images, videos and audios together: 12 in total, and audio cannot be the only reference.
• Gemini Omni Flash reference clips are capped at 3 seconds each, much shorter than Wan's 15 seconds total.
• Gemini Omni Flash addresses references in the prompt as <IMAGE_REF_0> and <VIDEO_REF_0>, zero-based in list order.
• A single image with no first or end frame on Gemini Omni Flash is treated as reference-to-video, not image-to-video.

Choosing by reference count

If you have a character sheet of many images, Wan 3.0 and Gemini Omni Flash take 10. If you have motion in a clip you want to borrow, Wan accepts the longest combined reference footage. If you only need to keep one face consistent, one image on any reference-capable row is enough.