# MiniMax H3 MiniMax H3 in Sloosh: text or start-and-end-frame video with sound, 5 to 15 seconds at up to 4K, in six aspect ratios. Last updated: 2026-10-05 **Key facts** - MiniMax H3 is MiniMax's omni-modal video model, released on 31 July 2026, and in Sloosh it makes 5 to 15 second clips with sound from text or a start frame. - MiniMax H3 offers 480p, 768p, 2K and 4K in Sloosh, and defaults to 2K. - MiniMax H3 offers six aspect ratios in Sloosh, including 21:9; with a start frame, the frame sets the shape. - MiniMax H3 always makes sound, and MiniMax says its speech is stable in 11 languages, including English, Spanish, Japanese and Arabic. - MiniMax H3 has a seed setting in Sloosh to repeat a result. Web page: https://sloosh.ai/docs/minimax-h3 MiniMax H3 makes video with native sound from text, or from a start frame and an optional end frame. MiniMax aims it at advertising and e-commerce, with strong instruction following and legible text. ## When to use it - Product moments and ads from a written description. - Animating from a start frame to an end frame. - For references, use [MiniMax H3 Reference](https://sloosh.ai/docs/minimax-h3-reference.md). For speed, use [H3 Max](https://sloosh.ai/docs/minimax-h3-max.md). ## How to prompt it - MiniMax's order: reference notes first, then the core idea (subject, place, event, style), then the scene in order: action, camera, sound. - Write camera moves in plain English with size and speed: "The camera pushes in with small amplitude at slow speed." One move per continuous shot. - Say "one continuous shot, no cuts" for a single take; otherwise "then" can turn into a cut. - Keep sound, music and speech apart: "Sound: ...", "Music: ...". Put spoken lines in quotes with the speaker, language and tone. Every clip has sound. - Write constraints as plain sentences; there's no negative prompt. Stay under about 7,000 characters. ## Example Text only: one continuous shot with a measured camera move and timed sound. [![A sage-green ceramic mug steaming on an oak table at sunrise](https://sloosh.ai/docs/m-minimax-h3.webp)](https://sloosh.ai/docs/m-minimax-h3.mp4) (video) _16:9, 768p, 6 seconds, Enhance off. Clips here play without sound; press one to pause._ **Prompt** ```text One continuous shot, no cuts. A matte sage-green ceramic coffee mug sits on a pale oak table by a window at sunrise. Steam curls from the coffee. The camera pushes in from a medium shot to a close-up of the mug with small amplitude at slow speed, ending with the handle on the right of frame. Soft morning light slides across the glaze. The mug's shape and colour stay exactly the same throughout. Sound: quiet room tone, a spoon set down on wood at 3 seconds, distant birdsong. Music: sparse acoustic guitar at a slow tempo, fading out at the end. ``` ## Settings in Sloosh - Aspect ratio: 21:9, 16:9, 4:3, 1:1, 3:4 or 9:16. - Resolution: 480p, 768p, 2K or 4K. - Length: 5 to 15 seconds. - References: none. - Start and end frames: both optional. - Sound: always on. - Seed: available, to repeat a result. - Prompt: up to 50,000 characters. Open it in [Video](https://sloosh.ai/studio/video) and pick MiniMax H3 in the model chip. The Generate button shows the cost first. ## Frequently asked questions ### How long can a MiniMax H3 prompt be? Sloosh accepts MiniMax H3 prompts of up to 50,000 characters, but MiniMax's own API caps H3 prompts at 7,000 characters, so keep yours under about 7,000. Put the subject and the motion first, and the style last. ### How do I write a cut in a MiniMax H3 prompt? Write the time of the cut: "At 00:03.500, the camera cuts to ...", and give the first shot no timestamp. For a single take, say "one continuous shot, no cuts", because MiniMax H3 can turn a "then" into a hard cut. ### How do I add dialogue in MiniMax H3? Put the exact line in quotes with the speaker, the language and the delivery, for example: at 1.5 seconds he looks up and says, in English, warmly: "Two minutes." Keep speech apart from the "Sound:" and "Music:" lines, and describe a new speaker by age, gender and voice. ### Can MiniMax H3 use reference images? Not this option. MiniMax H3 takes text or a start and end frame only, because MiniMax keeps image-to-video and reference-to-video separate. For a product, person or setting from your images, use [MiniMax H3 Reference](https://sloosh.ai/docs/minimax-h3-reference.md). ### Can MiniMax H3 make 4K video in Sloosh? Yes. MiniMax H3 offers 480p, 768p, 2K and 4K in Sloosh, and starts at 2K. 4K outputs need a Pro or Max plan; [Plans and credits](https://sloosh.ai/docs/plans-and-credits.md) explains plans. ## Sources - [MiniMax H3 prompt guide](https://huggingface.co/MiniMaxAI/MiniMax-H3/blob/main/docs/VIDEO_PROMPT_WRITING_GUIDE_base_en.md) - [MiniMax H3 reference guide](https://huggingface.co/MiniMaxAI/MiniMax-H3/blob/main/docs/VIDEO_PROMPT_WRITING_GUIDE_ref_en.md) - [MiniMax: H3 announcement](https://www.minimax.io/blog/minimax-h3)