H3 Max

- **Two input modes**: text-to-video, and image-to-video which requires a start frame and supports an optional end frame to pin where the shot lands.

- **Duration control**: whole-second lengths from 5 to 15 seconds, with 5 as the default.

- **Six aspect ratios for text-to-video**: 21:9, 16:9, 4:3, 1:1, 3:4, and 9:16 (16:9 default); image-to-video inherits the start frame's ratio.

- **Two resolutions**: 480P for drafts and 768P (1344×768, 24 FPS) for final takes.

- **Native audio**: sound effects and spoken dialogue render in the same pass as the picture; MiniMax lists dialogue as stable in 11 languages.

- **Per-second credit billing**: 7 credits per second at 480P, 15 per second at 768P.

- **Default generator model**: MiniMax H3 Max Turbo.