Related: Kimi-K3 on HuggingFace - https://news.ycombinator.com/item?id=49065752
GodelNumberingan hour ago
Back of the envelope calculation (could be off, correct me if I am)
If you are a large enough company that spends million+ on inference a month, it makes sense to buy a GB300 rack ($6M on top range from what I could find) which has 20.7 TB. Since the model is mixed trained (MXFP4), you would need less than 10% of the rack's memory to serve the full model. Aggregate HBM bandwidth: 576 TB/s. You can run over 6000 parallel agentic workflows (each with ~100k context on average) at ~30 tok/s.
Assuming the annual amortization+electricity at $1.5M/year and about 50% average annual utilization, you get less than 60 cents (USD) per million output token, for a frontier model with plenty of capacity to share, all your data never leaving premises and well over an order of magnitude cheaper!
As long as a company believes that the openweight models will continue to get more capable and 'AI is here to stay', this model provides the first solid footing for a decision to just buy a rack.
999900000999an hour ago
And hire 2 or 3 dev ops to keep it running ?
That another 400 to 700k.
It becomes your problem and not someone else’s. However, I don’t trust hosted LLMs for anything that needs to be private.
wongarsu43 minutes ago
Where do I sign up to get 200k/yr to keep one rack running? Sounds like an incredibly chill job
arjie40 minutes ago
Apparently it’s going to take the 3 of us to do this, mate. Going to get so much reading done.
LeonM20 minutes ago
What you get is not what you cost.
40% overhead is quite typical, so you'd be looking at $120k/year. In the USA I'd consider that a competitive salary for an admin capable or keeping a $6M rack of specialized hardware running 24/7.
russell_han hour ago
> However, I don’t trust hosted LLMs for anything that needs to be private.
Why not? Do you trust AWS with things that need to be private?
Kevcmk39 minutes ago
More than I trust frontier labs. AWS doesn't need to recoup 9 digits USD of capex
senderista32 minutes ago
So you can just use Bedrock?
lumost40 minutes ago
There will be cloud/SaaS vendors who have lower cost of labor/capital due to automation and financing terms.
Having these models in the open caps the inference margin.
GodelNumbering41 minutes ago
> And hire 2 or 3 dev ops to keep it running
Not a devops but I'd say one full time is already too many.
dboreham30 minutes ago
Yes but zero is not enough and where do you get a fraction of a competent dev op from?
layer825 minutes ago
From the other dev-op work you’re doing.
slicktux33 minutes ago
Just like that new jobs created by AI! Localized model maintainer/technician.
toomuchtodo33 minutes ago
You’ll slap some training on existing technologists/infra/sysadmin folks and perhaps have a support contract for the edge cases (hardware troubleshooting and advanced replacement).
(managed an entire data center building with thousands of servers a lifetime ago with ~2-3 other people, it’s only gotten easier over the last two decades imho)
clintan hour ago
Just let it manage itself, what could go wrong! :)
recklessan hour ago
I think the licensing that would likely apply to a company that's able to afford ~$6M rack and the associated infrastructure muddies this somewhat
petu37 minutes ago
I think internal use is allowed at any scale in the license?
> 4. The requirements set forth in Sections 2 and 3 do not apply to: (a) internal use of the Software, defined as any use that does not make the Software, its outputs, or its underlying capabilities available to third parties; [...]
jsnell9 minutes ago
It's very hard to make sure none of the outputs are ever made available to third parties. Source code can end up widely distributed (e.g. client-side js, open source). Prose will frequently get shared across organization boundaries (e.g. emails, websites, documents).
vidarh40 minutes ago
As far as I can tell, license fees are only applicable if you have more than 20m USD/year revenue from services provided using the model, or serve more than 100m users.
m_ke2 hours ago
Also open sourced a bunch of infra to go with it.
Anyone who claims open source and open weights models are "decel" needs to get their head checked
https://github.com/MoonshotAI/MoonEP
jvanderbot2 hours ago
This comment would be much better without the second line
ike_a2 hours ago
I'm not sure I understand the case for open-source models being decelerationist, is this it?
Decel:
- Potentially reduces investor appetite for funding big labs.
- More risk of powerful AI getting in bad hands -> more regulation.
Accel:
- More competition so big labs can't rest on laurels.
- More research in open, so all labs can accrete advancements faster.
I feel like open-source = acceleration has a much more clear argument. (and how bad would deceleration be in any case?)
sosodevan hour ago
I think the argument is that decentralization leads to deceleration because it means less centralized funding and data. Those are the two primary ingredients for accel.
The problem with the decel/accel rhetoric is that it lacks nuance.
Smaug123an hour ago
If your worldview is “most of the progress is made by closed labs, then open labs fast-follow” (which isn’t implausible given the documented distillation of Fable), and further that open labs cannot make make meaningful progress vs the closed labs except by fast-following and that they won’t pick up the ability to make progress after the closed labs are gone, then driving closed labs out of business slows down overall progress.
reissbaker40 minutes ago
I think it's pretty hard to hold that worldview: Anthropic couldn't ship a reasoning model until they copied DeepSeek R1's homework, and they've all copied DS-style super-sparse MoEs at this point too.
chorizo21 minutes ago
That’s a really good point. Folks really need to read the papers coming out of these Chinese labs. Every paper from the DeepSeek team has been a step change.
StevenWaterman2 hours ago
I think it's basically open weights => more inference competition => less profit from inference => less training competition
f311aan hour ago
> less training competition
I think you meant less research and experiments in big labs because they don't get all the AI money.
Training is expensive, but they also have more than 10 000 of employees combined and they cost a lot of money.
Iolaum2 hours ago
Open Source models decelerate growth of closed AI. For people who think (or want) AI = closed_AI then that argument has weight. Good luck getting them to update their priors.
zozbot2342 hours ago
Open source AI is actually a lot less "powerful" than genuine frontier models, i.e. it has a much tighter inherent capability ceiling. This is "decelerationist" from a purely AGI-pilled point of view but it's actually great if you're worried about a capabilities arms race putting AI Safety at severe risk.
Kimi K3 is plausibly a lot less dangerous than a totally jailbroken ChatGPT/Gemini/Claude Sonnet (let alone Opus or Fable!) and it's quite deeply weird how no one seems to be calling for those models to be banned or restrained by further regulation. Why the double standard against the less concerning (but more efficient!) open weight models?
ike_aan hour ago
Do you think they are inherently less powerful? I'd imagined that closed labs have a head start / more funding so the open labs are playing catch-up.
Is there a world where open source models end up at the frontier, or do you think there are structural/first-principles reasons why this won't happen?
zozbot234an hour ago
If you're targeting widespread local/on prem deployment which is what many open weight models are doing, that inherently limits your scale in terms of total model weights/inference-time compute compared to running in a few centralized datacenters. A centralized model will always be able to leverage a larger scale of deployment, placing it much closer to the genuine "frontier".
SirLordBossan hour ago
Why? Absolutely correct, especially considering the position of the person they're referring to
acedTrex2 hours ago
Why?
viccisan hour ago
I know it's a hard ask on this site, but I need you to start parsing content and not tone. It was a helpful bit of context, even if it was a bit vitriolic.
jvanderbot4 minutes ago
It depends on if we expect posters to be informative and include nuance.
Almondsetatan hour ago
Why should I waste time parsing content and not tone? Why can't the commenter just avoid the tone? It even saves time since you can write less!
viccis33 minutes ago
Because discourse around tone isn't productive. You could wipe this whole comment thread, starting with the parent of mine, and lose exactly zero information.
m_kean hour ago
[flagged]
oxzidizedan hour ago
> because it gets people like you going
So you're admiting you were trolling?
m_kean hour ago
no, the goal was to spark a conversation about the value of *open AI* and it looks like it worked
SubiculumCode37 minutes ago
The content was 'you need to get your head checked'. That isn't tone, that directly implying that if you hold that position, there is something wrong with you. It's rude and unnecessary.
Der_Einzige2 hours ago
[flagged]
vanuatuan hour ago
To me its clear that it is decel
the only reason other labs can catch up is because the frontier labs can be distilled, and they siphon a % of the labs' revenue to reinvest into the next iteration
full accel would mean nationalizing the big 2 labs and locking in manhattan project style until RSI
m_ke42 minutes ago
only if you only get your news from main stream business press and Big Lab propaganda channels
There's no chance K3 is a distill of Fable, it came out way too soon after the limited fable release to be feasbile.
If you look at all of the top ML conferences, chinese labs contribute way more to advances in ML than "Open"AI and Anthropic: https://www.reddit.com/r/TheMachineGod/comments/1pi4q7f/pape...
This K3 release just helped every other lab on the planet stay in the race by making it possible for them to build on top of it, placing them at the frontier starting line instead of having to spend billions of their own dollars and risking it all to attempt to catch up.
The open source contributions I linked to above will move the whole field forward and reduce the costs of training and inference for everyone.
Open science compounds on it self, every new advancement pushes the field forwards and opens up new grounds for future improvements.
It is impossible for a single closed lab to consistently stay ahead of the rest of the field, especially in a huge growing research area like machine learning. The only only advantage the big labs have is money, but the naive scaling game is not sustainable long term when you have to pay 10-100x more then the fast followers and we start getting more and more open models or use case specific models that can handle 90% of high volume use cases.
Research is a high variance, low expected value activity, meaning that the few large concentrated labs have to be conservative with their bets and double down on proven things when scaling up. The rest of the field is like a diversified portfolio, with thousands of players making smaller riskier bets that only require a few of them to succeed (like K3 did here, and DeepSeek a year ago)
EDIT: also if you look at most of the work from OpenAI, it's mostly taking existing promising open research work and scaling it up. (except for things like CLIP and etc from Alec Radford)
chorizo27 minutes ago
Appreciate this point. Back in grad school, I published a peer reviewed paper with all the source code and datasets used. Got heckled at a conference talk by staff from a commercial lab. They shouted, we figured this out five years ago, lol. Also our approach is still better. But they don’t release their source code or publish much, so no one knows what this approach is or if it’s actually better.
And years down the line, lots of other research labs used my code and cited my paper.
m_ke18 minutes ago
Oh this definitely happens all the time. I was an early employee at Clarifai, which won imagenet a year after alexnet and we were able to stay on the frontier for about 2 years before a bunch of open source models were matching our results. It was always some random PhD research project spinout or some random kid in Boston named Alec Radford.
We had a bunch of things that we never published that ended up being major research findings years later at top conferences.
calebkaiser8 minutes ago
OpenAI's head of strategic futures publicly stated that you can't explain the quality of the newest Kimi via distillation.
Further, you can just read the papers released alongside most open models. Plenty of hugely influential research results published that drive the frontier forward. It's not like these models are just existing architectures downloaded from Huggingface and trained on frontier lab APIs.
ZeroGravitas28 minutes ago
Distilling can be done by fast follower closed models too, so this argument against open models doesn't hold up.
pluto_modadic30 minutes ago
being able to replicate it in the open means that there's nothing special about frontier models.
Frontier models would have to do something extraordinary or unique, or unreplicatable, because clearly there is no moat, and US companies are sitting on huge nvidia valuations and get surprised when competitors beat them.
[deleted]2 hours agocollapsed
fahrradflucht2 hours ago
License: https://huggingface.co/moonshotai/Kimi-K3/blob/main/LICENSE
> If the Licensee or any of its affiliates operates a Model as a Service business, and the aggregate revenue of the Licensee and its affiliates exceeds 20 million US dollars (or the equivalent in other currencies) in total over any consecutive 12 months, the Licensee must enter into a separate agreement with Moonshot AI before using the Software or its derivative works for any commercial purpose.
+ the existing 100 million monthly active users, or more than 20 million US dollars for commercial products have to name Kimi clause
simonwan hour ago
Kimi 2.6 had the same janky license: https://huggingface.co/moonshotai/Kimi-K2.6/blob/main/LICENS... - looks like they've been doing that at least as far back as K2.
The models they released in 2025 - https://huggingface.co/moonshotai/models - were clean MIT. They started doing the "modified MIT" thing in January 2026 with moonshotai/Kimi-K2-Thinking
zozbot234an hour ago
To be clear, the restriction on "Model as a Service" past $20M yearly revenue is new to K3. K2.x had the attribution requirement for any commercial use with more than $20M monthly revenue.
simonwan hour ago
Good catch, thanks.
lossoloan hour ago
In what way was the license "janky"? Moonshot isn't a trillion dollar US behemoth. If these terms allow it to release near frontier models with open weights, so startups and anyone with enough hardware can use them, while charging only companies with more than $20 million in revenue or 100 million users, that seems like a reasonable trade off.
simonw38 minutes ago
I use the term "janky" for any time someone releases something under a supposedly open source license that doesn't comply with the OSI definition.
"Modified MIT" is the perfect example of that.
I'm not saying it's unreasonable, or that you can't release under such a license - it's your software, use whatever license you like!
I'll call it "janky" when you do.
lossolo26 minutes ago
So it's more like your personal definition, not the normal meaning of the word. Ok, because "janky" is informal slang also meaning poor quality, unreliable etc. I understand that you're using janky as shorthand for not OSI compliant. I just think that can blur two separate issues: whether a license qualifies as open source under the OSI definition, and whether the license itself is unreasonable/badly designed.
simonw22 minutes ago
I'm trying to make fetch happen.
bilbo0s43 minutes ago
Reasonable for people at the bottom of the tech pyramid. Certainly for startup guys this is heaven sent.
For people at the top of the tech pyramid, I could totally see why they'd want to put an end to all this "Open Source LLM" stuff.
throwaway274482 hours ago
I wonder how they'll figure out who to target for litigation when this license is violated.
mike_hearn6 minutes ago
They have certainly trained in some secret call/response pairs that would uniquely identify Kimi serving.
paxysan hour ago
How many companies host and serve models via API and have a $20M+ revenue? Going to be pretty straightforward to catch offenders.
bityardan hour ago
Software licenses aren't enforced through litigation as much as they are enforced through the _threat_ of litigation and legal risk. In other words, pretty much every company pays lawyers to minimize legal risk. Those lawyers inevitably look at all the contracts, agreements, and software licenses, and tell the C-suite what to do in order to keep their legal exposure as low as possible. "Don't violate other companies' IP," is pretty low-hanging fruit in those conversations.
It is a very rare (and ballsy, and perhaps incompetent) company that ignores their lawyers' recommendations to adhere to the letter of all of the software licenses they are bound to.
ffsm82 hours ago
They haven't litigated the last public non-compliance... Despite that one being extremely public. So probably not at all for now.
JumpCrisscross2 hours ago
> They haven't litigated the last public non-compliance
What was it?
drawnwren2 hours ago
Cursor was thought to be but they were later found to be using an authorized provider [1]
1 - https://x.com/Kimi_Moonshot/status/2035074972943831491?lang=...
[deleted]2 hours agocollapsed
Iolaum2 hours ago
Maybe because a non public agreement was in place?
ericpauley30 minutes ago
What is it a license for, though? Copyright? Are model weights even copyrightable?
[deleted]2 hours agocollapsed
embedding-shapean hour ago
Hah, so much for "open weights" :D Fair enough, they're at least downloadable, shame they didn't end up being actually open, nor open source, the community had really high hopes for this. But again, still available for download, so better than nothing else I suppose.
jhonofan hour ago
Open source projects frequently have separate commercial licenses no? This isn't abnormal.
embedding-shapean hour ago
No, I don't know a single project I'd call "open source" (as understood by the FOSS community) that restricts what you can do with it, that'd make it very much "not open source" as you're discriminating against specific persons/groups/fields of endeavor.
parodysbirdan hour ago
GPL licenses also restrict what you can do with it...
embedding-shapean hour ago
Beyond reciprocity which is the entire point of that license, what restrictions does it come with? I guess you could say that it has a restriction of adding new restrictions, but surely that's not what you're talking about?
eamag2 hours ago
> we build a self-evolving, hierarchically organized knowledge graph that agents continuously expand through web-scale exploration across knowledge-intensive and coding domains
That's interesting!
whimsicalism2 hours ago
It's funny that we've finally returned to tanh activation functions, time is a circle.
rhdunn14 minutes ago
From the paper (page 6 with a comparison to GLU and SwiGLU) they are not using tanh directly (i.e. f(x) = tanh(x)) but:
f_gate(b,x) = b * tanh(x / b) * sigmoid(x)
f_up(b,x) = b * tanh(x / b)
whimsicalism11 minutes ago
Still more of a tanh than I've seen in years
pinkmuffinerean hour ago
Wow this is fascinating enough that I’m actually going to read tfa lol
a-dub2 hours ago
knowledge graph guided task synthesis. very cool! i have long wondered about the "how do you get good coverage of all the tasks" problem.
maybe some interesting theoretical work there around the rate of production of new knowledge itself and various mechanisms (human approaches, mechanistic approaches, etc).
storus2 hours ago
What would be the current best method to fine-tune it for my own specific agentic tasks? LoRA + DPO? GRPO? Something else?
whimsicalism2 hours ago
LoRA + SFT, but it'll be big - better to wait for a finetuning API from one of the providers, I wouldn't jump straight to RL or off-policy pseudo-RL like DPO.
Tejush21 minutes ago
Any guess on the pre-training tokens/flops they consumed?
eamag2 hours ago
Can someone explain what are teachers in Multi-Teacher On-Policy Distillation? I can imagine math, coding and other verifiable domains, but they also have biology? Is it where distillation from bigger models come in?
sosodev28 minutes ago
They reference https://thinkingmachines.ai/blog/on-policy-distillation/
If I understand correctly, it's distillation via having a teacher model score each of the student's tokens for a problem based on their own probabilities of generating that token at each step in the sequence. The reward/loss is then applied as RL.
The multi-teacher bit seems to imply they're distilling from multiple models. It's light on the details, but it seems like it could be part of distilling from frontier/closed models. Provided they calculate the logprobs, which OpenAI seems to allow via API but not Anthropic. Maybe they have a way of estimating the logprobs externally?
This method can be used to learn any domain from the teacher. Biology included.
mike_hearn5 minutes ago
It's not that light on the details. I read the paper and they train several different models in parallel over a few different domains and then they distill from their own models to get the final model.
porridgeraisin32 minutes ago
They're other models yes.
webereran hour ago
Does anyone know if a torrent is available? I think it would take quite a while to download 1.5tb from their servers.
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colesantiago2 hours ago
This is amazing to witness. Moonshot open sourcing Kimi K3, a frontier AI and other components really means we are getting abundant AI for all of humanity.
Kudos to Moonshot for truly being what OpenAI should have been.
Fable-level and frontier AI should be open source and available to everyone for free.
embedding-shapean hour ago
> Kudos to Moonshot for truly being what OpenAI should have been.
Kudos to Moonshot for making these weights available for download. Lets not fool ourselves and claim these are "open source" by any understanding of the concept though, there are usage restrictions (even if you download them) and also training data isn't clearly broken down either, nor it it actually using a FOSS license.
lossolo44 minutes ago
> Kudos to Moonshot for making these weights available for download. Lets not fool ourselves and claim these are "open source" by any understanding of the concept though, there are usage restrictions (even if you download them) and also training data isn't clearly broken down either, nor it it actually using a FOSS license.
They will probably never release the training data because that represents a large part of their competitive moat. The same is true of US companies (Google, OpenAI, Meta etc) none of which has released the full training data for its open models.
They use private datasets that cost a lot to acquire, synthetic datasets and a lot copyrighted material for which they don't have licensing.
What matters most is that, with the necessary hardware, I can download a near frontier model, run it and modify it however I want. The other concerns you mentioned are just noise. And if my company is generating $20 million in revenue or serving 100 million users, it can probably afford a relatively inexpensive commercial license.
embedding-shape31 minutes ago
> They use private datasets that cost a lot to acquire, synthetic datasets and a lot copyrighted material for which they don't have licensing.
Yeaaah, and this, of course, is worth it, because it leads to you being able to download a near frontier model. Don't get me wrong, long-term humanity is probably better of with science with little regards to pesky things like ethics and provenance, but we also have a tendency to not fully realize the downstream or wider effects until way too late.
And sure, there is a lot of reasons to go with keeping your software proprietary too, I'm not trying to claim otherwise, same with training data. It's just that usually we don't call proprietary software "open source" unless it is open source, regardless of the reasons someone keep it proprietary or not, could be for whatever reason really.
bilbo0s32 minutes ago
>They will probably never release the training data because that represents a large part of their competitive moat
Not that what you've written isn't the case. However, in addition to what you've written, (or probably even before what you've written), there's the fact that everything they're training on is stolen IP. Same with US LLM labs.
Let's not kid ourselve's about where the training data is coming from. They are not asking artists, writers, coders, content creators, etc etc etc for permission to use their creations.
Anthropic, Moonshot et al are doing incredible things, but we shouldn't gloss over the costs. Both present and future costs are kind of enormous.
dboreham28 minutes ago
Exactly. I wish people would just stop saying "open source" regarding models. Even "open weight" is disingenuous. "self-hostable" would be more honest.
embedding-shape18 minutes ago
It's a gradient almost, with some steps. So far, I think you could categorize every single released so far as one of:
- Proprietary - No access beyond remote endpoints
- Downloadable - You can run it, but there are restrictions and training data/code isn't public and/or under FOSS license, nor are the weights under a FOSS license
- Open weights - The weights are under a FOSS license and downloadable without restrictions, but not all of training code/data is public or under a FOSS license
- Open source - The model architecture, weights, training code and data are all under a FOSS license, and you can freely download and use them without any restrictions
Few models hit the mark for "open source model", many models people call "open weights" would go under "downloadable" here, which personally I think would be accurate.
lenerdenatoran hour ago
What would it take to get an American open model to compete with this?
embedding-shapean hour ago
Latest "big" release from any of the bigger American lab must have been GPT-OSS-120b I think? Released ~summer 2025, so pretty much one years ago. Doesn't seem like it'll happen by itself, so something either forcing their hand figuratively, or something forcing their hand literally.
Personally I was wishing/hoping for one of the recent Gemma releases to be in the ~100B class at least, but sadly Google is keeping that all for themselves.
Stagnantan hour ago
NVIDIA-Nemotron-3-Ultra-550B-A55B was released in June 4th 2026 and I think it was the largest open US model until thinking machine's Inkling (975B) was released a couple of weeks ago.
layer8an hour ago
August 2025.
embedding-shapean hour ago
Bah, of course, thanks :)
lossoloan hour ago
Yeah, besides that, the only big other open source US model that was worth looking at was Inkling (975B params), Jul 15, 2026.
whimsicalism43 minutes ago
the longer i read this comment the wronger it gets
embedding-shape28 minutes ago
Don't make me add more of my thoughts to the comment, I can still edit it.
Deeply fun "care about improving people's lives" quote on your user page :p
whimsicalism15 minutes ago
how is 2025 two years ago? GPT-120b is not even close to the biggest recent American release, etc. etc.
segmondyan hour ago
if it's to be believed, it's so easy. you distill it, and you have a copy in 2 weeks, isn't that what China is doing? so 2 weeks from now, we should have one.
boomskatsan hour ago
An act of G̶o̶d̶ Congress?
chrswan hour ago
Something beyond my imagination
brcmthrowawayan hour ago
Is this p-hacking?
abratabiaan hour ago
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histiq2 hours ago
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tudou5272 hours ago
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kiaansaraiya2 hours ago
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samxli2 hours ago
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m00dy2 hours ago
I would want to see three things before drawing strong conclusions:
End-to-end tokens/sec and cost on realistic coding agent trajectories, including tool outputs and retries, not isolated decode benchmarks.
Cache hit rates and prefill cost for branching, multi-turn sessions.
Router-load distributions after post-training, where expert collapse or specialization problems often show up.