What the search results actually mean
"MiniMax H3 max" is an ambiguous search, and both readings deserve a straight answer. Some people mean H3 Max, the speed-tuned tier released at the end of August. Most, judging by the queries around it — max duration, max length, max resolution — mean the model's maximum: how long a clip can be, how big it renders, how many references it takes.
This guide covers both in one place: the hard limits of MiniMax H3, the different limits of H3 Max, and the practical part that matters for anime creators — how to plan a scene that needs more than the ceiling allows.
The limits, in one table
| MiniMax H3 (hosted) | MiniMax H3 (open weights, self-hosted) | H3 Max | |
|---|---|---|---|
| Clip duration | 4–15 seconds | 4–15 seconds | Up to 15 seconds |
| Max resolution | 2K (2560×1440) | 768p | 768p (480p option) |
| Aspect ratios | 21:9, 16:9, 4:3, 1:1, 3:4, 9:16, auto | Same | Same family |
| Reference images | Up to 9 | Up to 9 | Up to 9 (reference mode added after launch) |
| Reference video clips | Up to 3, 2–15 s each, 15 s total | Up to 3 | Up to 3 |
| Reference audio | Up to 3 clips, must accompany a visual | Same | Same |
| Native audio | 32 kHz stereo, generated with the picture | Yes | Yes |
| Generation speed | Minutes-scale for long 2K clips | Depends on hardware | Roughly real-time: a 5-second clip in under 3 seconds |
| Continuation | Audio-video continuation of an existing clip | Yes | — |
Three details behind the table matter in practice:
The 2K is a second stage. H3 renders at 768p and a separate hosted regeneration stage lifts the result to 2K using the original context. Only the base model's weights are open, which is why self-hosted H3 and every model post-trained from those weights — H3 Max included — stop at 768p. That is structural, not a setting waiting to be enabled.
15 seconds is the ceiling for a single generation, on every tier. Longer sequences are built from multiple clips — by continuation, by chaining, or by cutting. The clip chaining guide covers when each approach fits.
Audio references need a picture. An audio clip cannot be submitted alone; it rides along with an image or video reference. If you want to steer rhythm with a music cue, pair it with a visual.
What H3 Max changes — and what it does not
H3 Max is a post-trained tier built on H3's open weights in partnership with fal, tuned for prompt adherence, aesthetics, and throughput. On public image-to-video leaderboards it ranks above the base H3 it came from, so within 768p it is not a compromise. Its caps are narrower in exactly two places: no 2K stage, and no continuation mode. Everything else — 15-second clips, mixed references, native audio — matches. The H3 Max workflow guide covers how to split drafting and finishing between the tiers.
One beat, one clip: working inside 15 seconds
The instinct is to fight the cap — cram a scene into one generation. Anime does not want that anyway. A typical anime scene is cut into shots of two to eight seconds; a 15-second window is generous for a single shot and wrong for a whole scene. Plan accordingly:
One beat per clip. A 15-second clip holds one held action with a beginning, a turn, and an end. Trying to fit three story beats into it produces mush at any resolution.
Choose duration by the beat, not the maximum. A reaction shot wants 4 seconds. A walk-and-reveal wants 8. Only a sustained performance — a sung line, a slow approach — earns the full 15. Shorter clips also cost less and fail cheaper.
Let the storyboard decide the cut. Inside ArcLoop, an episode is broken into shot cards on the Storyboard — each card is one generation, with its own duration, camera, and @ asset references. The 15-second limit stops being a constraint because no shot needs to exceed it; the scene's length comes from the Edit timeline, where the clips are arranged, trimmed, and replaced. The duration and beat guide covers how to size each shot.
Spend resolution where the audience looks. 2K is for the final pass on shots that carry the sequence — the hero frame, the title beat. Drafts, timing tests, and shots that will be small in the edit can run at 768p on Max or at lower settings, the same cost logic that applies to every tiered model.
Aspect ratio notes for anime
- 16:9 for PVs, openings, and anything headed for a landscape player.
- 9:16 for vertical shorts and micro-drama; frame the character in the central band, because the top and bottom get covered by platform UI.
- 21:9 for a cinematic title beat — but remember the 2K stage's pixel budget is fixed, so ultra-wide trades height for width.
- Auto when a reference image should dictate the frame; the output follows the input's shape.
FAQ
What is the maximum duration for MiniMax H3?
15 seconds per generation, with a 4-second minimum. Longer pieces are built from multiple clips.
What is the maximum resolution?
2K (2560×1440) on the hosted model. Self-hosted H3 and the H3 Max tier top out at 768p because the 2K regeneration stage is not part of the open weights.
Is "H3 Max" the same as the maximum settings?
No. H3 Max is a separate, faster tier with a 768p ceiling. The base model's maximum output is the 2K hosted result.
How many reference images can I use?
Up to nine images, three video clips, and three audio clips per generation. In ArcLoop, the character's bound Main image and Reference images are what the model reads when you reference the asset with @.
Limits are a cutting guide
Fifteen seconds and nine references sound restrictive until you plan like an animator: one beat per shot, references bound to the character rather than re-uploaded each time, the scene assembled on a timeline. Open a project, break the scene into shot cards, and let the limits tell you where the cuts go.
