MiniMax H3 Day-0 Support in ComfyUI: Open Weights, Native Audio, and 2K Video

Posted by vblanco 9 hours ago

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Comments

Comment by embedding-shape 9 hours ago

> We found that the model's modulation weights (~40% of the total parameters) could be pruned and replaced with a functionally equivalent lookup table, dramatically shrinking the memory footprint with no loss in output quality.

Is this a common approach to reducing weights with "no loss in output quality", assuming this is true? Seems almost too simple to work. If this is doable, would this be applicable to LLMs as well?

Neat with native frame-to-frame generation, but wonder how easy it is to "link" together clips at the intersection, typically the models kind of lose the "momentum" across these stiches, being able to merge things with frame-to-frame between clips might help with this it feels like.

Comment by liuliu 6 hours ago

It is a well-known trick, given that the timestep is between 0 to 1, you can slicing them at any resolution (1000, or 10000, give or take), and then keep a look-up table for modulation scale / bias etc for each. It is quite different from quantization and it is indeed lossless.

It is also only applicable to diffusion models as only these operates at per-timestep.

Comment by xienze 5 hours ago

So... why didn't the model ship this way to begin with? They just wanted to waste VRAM for fun?

Comment by liuliu 5 hours ago

They ship a complete checkpoint for easily management (inference & training) in their own infrastructure. Moving to a LUT would make training on these layers impossible. BTW, these are not useful for lightweight fine-tuning, but might still be useful if you do serious post-training work.

Of course, these are also not an issue for things like FLUX.2 which adopts DiT-Air arch, that doesn't have this wasted space issue.

Comment by doctorpangloss 4 hours ago

It may or may not be true. The people who made this modification and the other commenters didn't do anything rigorous to verify what they did. They just eyeball it. They could very well make some other error - this has happened frequently - that developing on prod, not knowing what they are doing, has and hopefully will again solve.

Comment by yorwba 8 hours ago

"Modulation weights" here refers to weights used to adjust layer normalization depending on the task (adaLN). General-purpose LLMs generally don't have those in the first place.

Comment by liuliu 5 hours ago

One thing similar would be projecting both the head.weight and the final LLM activations into a smaller vector space, since that is basically just cosine similarity ranking step (so that would reduce the head.weight size). But again, it must be tried many times and just not working as well. LLM space is pretty saturated with tricks.

Comment by _diyar 8 hours ago

Also begs the question whether this is applicable for high-throughput applications on FPGAs, which are to my novice mind basically LUTs, right?

I remember a paper which was posted on HN a few weeks ago where somebody implemented KAN networks in FPGAs, since those can readily be approximated as LUTs.

Comment by knicholes 8 hours ago

Whoah, could this mean we can treat layers like a jpg, where we come up with a formula that estimates the weight values of a layer instead of storing all of the weights?

Comment by swiftcoder 7 hours ago

This is more or less what those lovely 1.5 bit quantisations are already doing

Comment by vblanco 9 hours ago

Im running this on my 4070ti super (16 gb vram), and it takes 10 minutes for a 10-seconds 480p video. but the results are spectacular.

Comment by Maxious 9 hours ago

FWIW on a 5080 16GB it takes 3 minutes for 10 seconds 480p video (the mouse video workflow with length changed from 5 seconds to 10 seconds)

Comment by embedding-shape 8 hours ago

FWIW on a 6000 Pro it takes 68 seconds for 10 seconds 480p video, (cold) same demo workflow as you used. Set "megapixels" to 2.0 (1920x1088) and same video seems to take 5+ minutes, not sure if everything is right/correct at the moment.

As far as I can tell, the current ComfyUI nodes don't even do compilation, and I haven't looked into what attention mechanism they're using, but I'm sure with time these durations will come down even more.

Comment by pkroll 7 hours ago

People on reddit have definitely pointed out that sageattention will speed up the renders.

And it's literally the first day. Someone will make a distilled 4-8 step LoRA and we're off to the races.

Edit: did a couple of 10 second long 864/480 i2v videos on my RTX Pro 6000: sageattention bumps them up 33%, that is to say, 140.89 seconds without sageattention becomes 105.69 with sageattention on (if using the KJ Sageattention node, "allow_compile" doesn't seem to affect it, just "sage_attention" set to "auto" works fine).

EasyCache also appears to work, but does affect quality, at least with the default threshold or even down to 0.10. Still, at 0.10 threshold the same render above, with sageattention, is down to 71.33 seconds, so depending on your use case the quality hit might be worth it. Also it seems that with EasyCache the video still matches the un-EasyCached video (with the same seed), so you could use it to do seed hunting.

Comment by loldog 2 hours ago

Knowing r/StableDiffusion this will run on a Raspberry Pico's PIO core in real-time by end of this week.

Comment by wincy 4 hours ago

What’s the vram usage? I’ve got a 5090 so as long as I can fit it in memory the gen times should be roughly equivalent ~10%

Comment by embedding-shape 2 hours ago

Depends on what weights, I landed on:

    diffusion model: minimax_h3_fl2va_bf16.safetensors
    text encoder: qwen3vl_32b_minimax_h3_nvfp4_awq.safetensors
    video VAE: minimax_h3_video_vae_fp16.safetensors
    audio VAE: minimax_h3_audio_vae_fp32.safetensors
Ends up at ~83GB, but they also shipped bunch of pruned + quantized versions of the diffusion model, might fit with a 5090: https://huggingface.co/Comfy-Org/MiniMax-H3

Comment by teaearlgraycold 4 hours ago

Waiting for the “FWIW on a B200” reply

Comment by embedding-shape 3 hours ago

I was kind of hoping to induce that too! But sadly, no one has come to our rescue yet.

Comment by halJordan 3 hours ago

Runpod waiting for you

Comment by Sohcahtoa82 2 hours ago

I must be doing something incredibly wrong.

I'm on an RTX 5090. I told it to make a 5 second 864x480 video, it's been running for over 30 minutes and is only 35% done in the SamplerCustomAdvanced step.

EDIT: Oh, I'm an idiot. Forgot I had a llama.cpp webserver running with a model loaded. Killed it and it finished very fast.

Comment by ddevnyc 9 hours ago

I am particularly curious how multimodal models will work with types of knowledge that are inherently non-text. For example, SOTA LLMs really suck at electronics, especially analog electronics.

Is MiniMax H3 capable of logical / technical reasoning, or is it purely art oriented?

Comment by jononor 8 hours ago

Suck at what aspect of (analog) electronics specifically? Not contradicting the claim, just want to understand it.

I have not tested yet, but I suspect that LLMs with a harness that can execute code can do SPICE simulations rather ok these days? I have seen MCPs for measurement equipment also, maybe they can even close the physical loop?

Comment by colechristensen 1 hour ago

> I have seen MCPs for measurement equipment also, maybe they can even close the physical loop?

I'm working on this but for various reasons can't have my physical lab up at the moment. But yes there are many options for connected test equipment that could rather trivially be interacted with via LLM or pretty easy to write libraries.

Comment by ddevnyc 6 hours ago

spice is a very bad simulation. it's not like a unit test or a VM. it works very differently to the real thing, only approximating it in some highly controlled situations.

Comment by embedding-shape 8 hours ago

> work with types of knowledge that are inherently non-text

What are those things exactly? AFAIK, everything we can "know" can be written down, one way or another, even analog circuits.

Also, what SOTA LLMs are you referring to? GPTs been handling analog circuits fine for quite some time, I want to say for at least one year? I've been "pair programming" a bunch of working circuits with GPT models since probably GPT 5 or so.

Comment by ddevnyc 6 hours ago

> AFAIK, everything we can "know" can be written down, one way or another, even analog circuits.

writing down circuit diagrams is like cooking about music.

> what SOTA LLMs are you referring to?

I have done a survey among analog electronics designers just a couple weeks ago and they all said that their forays into LLMs were great for digital electronics, code, and firmware, but for analog they were pretty terrible, with a variety of LLMs, according to everyone.

Comment by chrisjj 2 hours ago

> everything we can "know" can be written down

Do you know how to ride a bike?

Comment by embedding-shape 1 hour ago

I think that's different though, that's "doing" rather than just "knowing". You can ride a bike without knowing how it works, and obviously vice-versa too. I don't see circuit diagrams as "doing" though, but the soldering part of building circuits definitely is that way though, you can't just read about it and excel first time you pick up an iron, you have to practice and understand it with your body, like bicycling.

Comment by chrisjj 18 minutes ago

> that's "doing" rather than just "knowing"

Yet I know it even when I am not doing it.

I bet you have dozens of skills you cannot represent in words.

Comment by ddevnyc 2 hours ago

ahhhh, that's such a great example

Comment by chpatrick 8 hours ago

I've had great results on electronics with Claude and Gemini.

Comment by ddevnyc 6 hours ago

what sorts of things have you designed with it?

Comment by chpatrick 36 minutes ago

Reverse-engineering my house's intercom system.

Comment by echelon 8 hours ago

They can be used to create synthetic training data for robotics. It's not the best approach, though.

Comment by ddevnyc 6 hours ago

i bet they're good for it. however robotics aren't electronics. that's a completely different space.

Comment by mwigdahl 9 hours ago

If you wouldn't mind sharing, what's your Comfy workflow for this? I have the same video card setup and would like to give it a shot.

Comment by vblanco 9 hours ago

just the default one in the link for image-to-video

Comment by robbru 9 hours ago

1 minute for a second of footage, that is awesome! Thanks for sharing.

Comment by chrsw 8 hours ago

Huh, interesting. I tried to generate a 10 second 1080p clip on a bigger machine and the results were quite poor. Unusable for anything, in fact.

Comment by 384028345 8 hours ago

How much RAM does your machine have?

Comment by torment-nexus 26 minutes ago

This is an interesting problem. A similar approach that worked for us was to only load the tools the agent actually needs for each task.

Comment by sheesdev 9 hours ago

The mouse render is surprisingly good. Several of those clips stood out to be a pretty big leap in terms of current SOTA models.

The only one that looks "off" is the beverage ad video during the can opening clip, it still has that "AI smoothening" effect. Good thing this can be done pretty well using traditional rendering.

I feel like for a good while now we'll transition into a process that uses traditional "close-up" rendering/shots + AI generated wide-shots or quick cuts.

Exciting, but also troubling. This being open-weights is a massive win for the community though.

Comment by jareklupinski 4 hours ago

right before that, there's the part with the person hiking up the dish and 'breathing', and the clouds of water vapor coming out of their mouth don't line up with their breaths

devs pls fix

Comment by chrisjj 2 hours ago

> the clouds of water vapor

Really poor. In the last shot, looks more like smoke.

The fact the director even included this item in the reel speaks volumes.

Comment by echelon 8 hours ago

This is still about a year and a half behind Seedance 2.0/ Seedance 2.5

But it represents a coming price pressure that will face the leading foundation models. Open source will prevent runaway costs.

Moreover, it prevents the hair-trigger platform safety checkers from shutting down creative work. Video models are notoriously bad at shutting down a huge number of requests.

Creatives will prefer to work on cloud or private GPU clusters. Waiting 10 minutes for a few seconds of 480p is unacceptable. Hobbyists will have fun, but most actual production work is happening in the cloud.

Artist's time is worth money, and they like to spin up dozens of concurrent generations at a time to more quickly explore the generation state space and make progress on completing work.

Comment by coder543 2 hours ago

A year and a half behind Seedance 2.0? That is a bold claim that needs evidence.

According to one user preference leaderboard, MiniMax H3 is already ahead of Seedance 2.0 based on thousands of A/B votes: https://artificialanalysis.ai/video/leaderboard/text-to-vide...

I haven't seen any user preference comparisons between Seedance 2.5 and MiniMax H3. As an upper bound, H3 cannot be more than 6 months behind Seedance 2.5 since H3 is already ahead of where Seedance was 6 months ago.

Comment by echelon 2 hours ago

> A year and a half behind Seedance 2.0? That is a bold claim that needs evidence.

SOTA a year ago was Kling 2.5, and H3 does not look or perform at that level.

The Artificial Analysis rankings are whack. They rank Omni first, which is incredulously wrong. Google's models broadly suck, and there they all are - right at the top.

Artificial Analysis has notoriously ranked models such as Grok Imagine highly and continues to rank Happy Horse as a good model despite the model being absolute garbage.

Could it be because they are subject to broad based statistical attacks? It's easy to encode information about the origin of media in either its metadata or output frames. Or maybe there's simply no overlap between creatives and people who click on ELO scores.

I've spent thousands upon thousands of dollars generating video. I will stand by the claim that nothing touches Seedance 2.0 / 2.5.

It's good that we're getting better open weights. It puts price pressure on the foundation model companies. But these open models are not a substitute for Kling or Seedance yet. Not even close.

Comment by Mashimo 9 hours ago

> The result gives a total memory footprint reduced by 66%, from 123.6 GB in full precision to 42.5 GB with the smallest models variants. Combining this with our dynamic VRAM offloading enables a next-generation 2K video model to run locally on a GPU like the RTX 3060.

Pretty cool.

But assuming you have a 16GB 3060, how long would it take to generate a 15 second clip?

Comment by ranyume 4 hours ago

Around 10 minutes.

Comment by fodkodrasz 9 hours ago

On one hand: impressive. On the other hands aesthetically it all looks painfully bland and generic.

Comment by _diyar 8 hours ago

I agree. But is that the model or the prompt?

I remember reading a report where people running AI-model instagram account were using insanely long and detailed prompts about the setting, lighting, makeup, pose, disposition, clothing, etc. about their models. Presumably with some reference image of the face / body to remain consistent across images.

It‘s not clear to me whether a sufficiently detailed prompt can generate actually interesting video with a natural ”texture” (for lack of a better word).

Comment by razster 8 hours ago

That would be the prompt. With the right assistance from Qwen3.5/Ornith I was able to achieve some amazing results. Unfortunately due to their licensing I'm not allowed to use it in the USA, so I had to halt testing.

Comment by iamcoder18 7 hours ago

[dead]

Comment by chrisjj 1 hour ago

> But is that the model or the prompt?

All looks...

Comment by fwip 8 hours ago

I mean, even the demo prompts on the ComfyUI page aren't adhered to by the model. From the first prompt, one of the four lines:

> TRANSITION: a violent WHIP PAN off the rooftop that SMEARS the floating words away with it, motion-streaked —

And the video just didn't do any of that transition at all, it just replaced it with a cut. If you look at the rest of the prompts, you'll find similar lines that are just totally ignored. Except maybe the mouse one, I didn't see anything wrong with that off the bat.

Comment by SV_BubbleTime 9 hours ago

This, today, is the absolute worse this model will ever be. Chill.

Comment by mihau 3 hours ago

Has anyone tried running this on Mac device? (e.g. Mac Studio Ultra)

Comment by Havoc 2 hours ago

Failed with a software error for me

Comment by storus 7 hours ago

Reference-to-video mode seems like all that was missing to enable completely independent cinematography as right now one couldn't stitch different scenes together properly without altering substantial portions of the scene.

Comment by SV_BubbleTime 9 hours ago

I saw the samples people have posted. Immediately deleted LTX2 and WAN folders. Those are completely worthless now.

There is some debate on the license for those in the US, UK, EU, plus… no comment other than whew those samples though!

Comment by Maxious 9 hours ago

"Regions such as the EU, UK, South Korea, and the US are currently developing or enforcing AI-related regulations that may have specific implications for generative video models"

You just have to pinkie promise you won't make disney mad and they will send you a licence https://huggingface.co/MiniMaxAI/MiniMax-H3/blob/main/docs/Q...

Comment by SV_BubbleTime 9 hours ago

I do work animations for fun and internal use only (mostly jokes). I MAY reach out to them.

Comment by razster 8 hours ago

Worth if you plan to use it for production use. If you use it for personal or as mockup, then what they don't know won't hurt them? ;)

Comment by satvikpendem 9 hours ago

I've said it before and I'll say it again, human directors are still valuable, as they use AI video editing tools to generate the shots they want and put them together in a cohesive way. Previously they might've used film and actors but if they can just prompt the AI (or create workflows as seen with ComfyUI) then they arrange them together just like how an EDM producer doesn't actually play the instruments but instead the creativity is in the arrangement.

I suspect it'll be quite a while until AI gets a good enough aesthetic sense to do this, as even with static HTML websites humans can easily see that it's AI slop.

Comment by ilaksh 7 hours ago

Seedance 2.5 just came out and it is incredible，significantly better than this for a lot of cases. This one is the latest _free_ video generator.

But as far as your composition tools, they are already available.

Comment by hnlqpx99l9 8 hours ago

Learned something, upvoted

Comment by nfnmema 8 hours ago

Any tutorial for me to learn how to use

Comment by bhawika_kaushik 3 hours ago

[flagged]

Comment by rvz 9 hours ago

Hollywood and the film industry on red alert. Too bad.

This is AGI.

Comment by trwhite 9 hours ago

The example video just looks like the highly produced art (TV, commercials, games) other people have created. I find it impossible to believe this wasn't trained on other people's work, and there is no protection for it. Terribly sad. A lack of original thinking is coming.

Comment by anonymousd3vil 2 hours ago

It is coming up with Seinfeld episodes even with voice overs. Unless it is trained to do so, don't think that would happen. This model is just around the corner from getting banned due to this copyright issue. (which i hope not)

Comment by echelon 8 hours ago

> A lack of original thinking is coming.

As with the arts, 99.9% of people can't use these models to express vision, get attention, or achieve distribution.

The game is the same as it has always been. You still need hard work, taste, something important to say, the ability to articulate it, good timing, and luck.

Nothing has changed. We can just build faster.

What this does enable is for more to be created that caters to a wider variety of interests. It disrupts existing structures of capital allocation, production, and distribution and gives new players a chance to reshape the game.

The bar will rise and people will still be running at the same pace on the treadmill. There will be more to see, but less time to see it.

Comment by jackp96 7 hours ago

Eh, the technical examples are impressive. But normal people really don't like AI. And I don't think that's going to improve if we really start to see job displacement.

I see a future here for digital advertising, for design mock-ups, for political propaganda, for robotics model training/world simulation, for fan movies, etc.

But the film industry is struggling to get eyeballs and butts in seats already; using a tool that most people inside-and-outside the industry loathe isn't the answer to fixing that.

At most, I could see it used for pre-viz/pre-production work in Hollywood.

Comment by MSFT_Edging 9 hours ago

Can't wait for netflix to be topped on unimaginative nonsense meant to have in the background while you scroll your phone.

Comment by toasty228 9 hours ago

Unlimited slop "content" to fill decomposed brain shaped vessels, the future is bright!

Comment by kyriakos 9 hours ago

Unfortunately Hollywood been feeding us human generated slop for a long time already. Transition won't be hard.