MiniMax H3 reference limits: 9 images, 3 videos, 3 audio, 12 total

MiniMax H3 accepts up to 9 reference images, 3 reference videos and 3 audio clips in one request, and no more than 12 files in total. MiniMax's model card and API docs state those counts; Sume enforces the counts on both minimax-h3 and minimax-h3-max, and its catalog notes add that audio cannot be the only reference.

Counts are from MiniMax's model card and API docs; clip lengths and rules from Sume's catalog notes in code and the Video generation docs, read 2026-09-29.

What are all the limits?

Where do references go in the request?

In input_references on POST /v1/videos, each entry typed image_url, video_url or audio_url. For a first or last frame use frame_images instead; if you send both fields, frame_images wins and the request is image-to-video. See the first and last frame post.

What happens if I go over?

Sume checks the counts when it validates the request, so an over-limit request is refused at submit instead of becoming a job. In current code the message names the limit, for example that minimax-h3 accepts at most 9 image input_references.

Does a reference always change the price?

Reference videos and audio do not add a per-file charge in Sume's pricing code. On minimax-h3, reference images after the fifth do; see MiniMax H3 reference images: what you pay past the fifth.