MiniMax H3 is the first open weights omni-modal video model with state of the art native stereo generation on Comfy, so we’re teaming up to see what the community builds with it!
Fully virtual. Two weeks. Open to everyone, local rig or Comfy Cloud.
Need help or inspiration? Visit Reddit or join the Comfy Discord #minimax-h3-challenge channel to see what the community’s been creating and chat with Comfy and MiniMax teams directly.
The Challenge
Build a short piece where sound and motion are inseparable. The audio has to come out of the same H3 pass as the video — dialogue, foley, ambient sound, a beat that drives the motion, whatever direction you want to take it. Feeding in a reference audio clip that does not contain unlicensed IP to steer the generation is completely fair game and often the best way to get strong audio out of H3. What’s not allowed is stitching a separately-made track onto the video afterward, outside of H3.
Good news- Comfy just got easier to use with the help of Comfy MCP, available locally and in Comfy Cloud. Use natural language and your agent (Claude, Cursor, etc.) to do a hardware check and adapt your workflow accordingly, tweak or debug without needing to know all the technical details, and more. Use Comfy MCP for a chance to win a special MCP bonus prize!
Timeline
[Day 1] Thurs. 8/20: Challenge & #minimax-h3 Discord channel launch
[Days 1–14] 8/20-9/1: Build and submit
[Day 16] 9/2: Comfy livestream with guest judges and winner announcement!
How to Enter
Every submission must include:
Your final output: the video, with H3-generated synced audio
Your ComfyUI workflow file: the actual .json so we can see how you built it
To submit:
Fill out the submission form
Post your video on our Reddit megathread
(Optional) Share on your socials (X, Instagram, LinkedIn, YouTube, TikTok) tagging @ComfyUI @MiniMax #ComfyH3 so we can reshare our favorites!
Requirements:
A major portion of your piece must be built in ComfyUI using H3. Beyond that, any tools, models, or techniques you want to combine it with are fair game.
All submissions must be lawful, SFW, and must not contain unlicensed IP or likenesses
By submitting, you agree to allow ComfyUI and MiniMax to feature your work (with credit) across our channels
Limited to one submission per user, 90 seconds maximum length
Do I need to pay to use H3?
Nope. If you’re running H3 locally in ComfyUI, it’s free! Update to ComfyUI 0.30.0+, grab the model from here, and run it on your own GPU.
We’ve optimized H3’s memory footprint by 66%, so it’ll even run on consumer cards like an RTX 3060. Use Comfy MCP to ask your agent to suggest the right H3 version for your hardware or optimize your workflow for your machine.
Prefer not to deal with local setup, or don’t have the hardware? Run it through Comfy Cloud instead! New users gets 5 free GPU-powered runs with no card required, and it’s credit-based beyond that.
Prizes: 4 Ways to Win!
Grand Prize: Best Overall
RTX5090-O32G-G
Best Technical/Workflow
RTX 5060 Ti
Best Creative
RTX 5060 Ti
Built with MCP Bonus
RTX 5060 Ti
All prizes will be shipped directly to the winners with customs costs covered by organizers. To the extent items cannot be shipped, a cash-equivalent prize will be offered.
Every entry is eligible for our spotlight reel, regardless of whether you place!
How Winners Are Chosen
Every submission is reviewed by a joint panel of creative technologists from Comfy, MiniMax, special guest judges, and community input using the criteria below.
Grand Prize: Best Overall
The top finishers from Best Creative and Best Technical advance to a final round where our panel of judges selects winners by discussion. We’re looking for the entry that best shows what H3 makes possible: strong to watch and built in a way others can learn from.
Best Creative
Audio sync realism and intentionality (0-5)
Creative execution and originality (0-5)
Deliberate craft (0-5)
Evidence that you’ve actually shaped the result beyond prompt engineering. Judges will look for modified/non-default parameters, multiple linked passes visible in the workflow structure, or a couple sentences describing what was tried and changed
Best Technical/Workflow
Novelty of technique or approach (0-5)
Workflow quality (0-5)
Annotated, clean, replicable by someone else
Community value (0-5)
Would this actually help someone else?
Built with MCP Bonus
Effectiveness (0-5)
Did the agent meaningfully drive your process, not just generate one line?
Insight value (0-5)
How much the shared prompt teaches the community about prompting H3 through MCP
Output quality (0-5)
FAQ
Can I use both local and Cloud?
Yes! Mix and match however you want. Just tell us which path you used when you submit.
What’s the Comfy MCP?
It lets you drive ComfyUI workflows locally or in Cloud through an MCP-connected agent/tool (Claude, Cursor, etc.) instead of (or alongside) the regular UI.
It allows you to use natural language and your agent (Claude, Cursor, etc.) to drive ComfyUI workflows both locally and in Cloud. Try doing a hardware check and adapting your workflow accordingly or tweaking or debugging without needing to know all the technical details. Use Comfy MCP for a chance to win a special MCP bonus prize!
What happens to my workflow file after I submit it?
All submissions (workflow + output) are shared as-is in the H3 Reddit megathread for the community to browse, remix, and comment on. Winning entries get the full treatment: a dedicated write-up and feature across our channels!
Can I submit more than once?
Submissions are limited to one per person.
Can one entry win more than one category?
Yes! Best Overall/Grand Prize is pulled from the top finishers of Best Creative and Best Technical/Workflow, so to win Best Overall, your entry needs to have placed in one of those two tracks first. The Built With MCP Bonus is separate from all of that: any MCP-tagged entry is automatically in the running. So one entry could win a title as well as the Built With MCP Bonus.
Is there a public/community vote?
Not a formal vote, but the community isn’t just watching from the sidelines either. During the guest judge livestream on 9/2, community chatters and reactions from social will be part of what the judges weigh alongside the scoring criteria. We wanted a way for the community to genuinely have a say without opening up a survey or ballot that’s susceptible to botting.
What counts as “a major portion built in ComfyUI using H3?”
H3 needs to generate the core video and audio in ComfyUI. Everything else is fair game: upscaling or restyling the output, color grading, adding titles or credits, feeding in a separately-made first frame or reference image to steer H3, or cleanup in another tool after generation. Keep in mind that using tools outside of ComfyUI may make your workflow less replicable if you’re going for the Best Technical prize.
I’m in a country where I can’t receive the GPU. Am I still eligible to enter/win?
Yes! You can enter and win no matter where you’re based. If we’re unable to ship the GPU to your country because of import restrictions, export controls, or customs issues, we’ll offer a cash-equivalent prize instead. Winner is never contingent on where you live!
Will I get any feedback if I don’t place?
We can’t guarantee individual feedback given submission volume, but all entries are shared in the Reddit megathread for community input.
Can I submit a workflow I built before the challenge started?
We welcome you to start from a workflow you already had, including one built before the challenge.
Thank you Comfy and Minimax, I have 2 questions to ask.
Can we use Comfyui on external providers like runcomfy or RunningHub but sticking to the official and community nodes?
Can the video be driven by a custom audio using the masking method (which is seperate from referencing audio)?