This is almost certainly fake. A few days ago there was supposedly a Fable 5 checkpoint "up for sale on a deep web forum", now there is supposedly a Mythos-class model leaked on Hugging Face. This is just a way to get less knowledgeable people to run code (as in malware) on their machines.
Not saying if it's fake or not cause I have no idea, but the model is almost 8 terabytes so it's not something a casual, less knowledgable user is going to download and run on a whim.
Wouldn't the malware have to sit somewhere else anyways? .safetensor tensors aren't "executable", so malware wouldn't sit there. Unless the "malware" is some misbehavior of the model?
So the idea would be to use some existing model architecture and model that has been poisoned that will actually be parsable by existing inference software to try to do malicious things if it's run in a harness that allows tool use/etc? On the assumption that the type of person to download and try to run inference with the model would be smart enough to know to do that but dumb enough not to realize that "mythos" architecture wouldn't be in any inference software yet?
A small slice of demographic but I guess it must exist. Most people that would download it would just be looking at the organization of the .safetensor file to figure out the architecture to actually implement inference to run it.
consider most naive possible way one would try to deceive users without exorbitant budget -> attempts a few things you naively would do -> recovers it by chance?
Back in the day people used to upload new movies on public torrent sites that turned out to be something completely different in order to troll people. This is probably the same.
If not, this is one hell of a way to save their IPO.
> In regard to collections of facts, O'Connor wrote that copyright can apply only to the creative aspects of collection: the creative choice of what data to include or exclude, the order and style in which the information is presented, etc.—not to the information itself. If Feist were to take the directory and rearrange it, it would avoid the copyright owned in the data. "Notwithstanding a valid copyright, a subsequent compiler remains free to use the facts contained in another's publication to aid in preparing a competing work, so long as the competing work does not feature the same selection and arrangement", she wrote.
A lot of this shit is gonna have to wind its way through the courts before we know for certain.
I think another concern is poisoned weights (X-LSB-Attacks https://arxiv.org/html/2409.19310v1 ) or even the pytorch CVE-2026-24747, although that was nearly a year ago.
But might be best not to go against site admins by posting it.
X-LSB-Attacks still needs code, if you only download safetensors and run for example numpy, it is impossible, it would require you to download some kind of custom loader, which isn't present here and i have said only safetensors, NVFP4 is also 4 bits, it is difficult to poison when it is so low.
CVE-2026-24747 is about .pth and .bin files, i specifically said safetensors.
Might not be best, potentially, however what i said is mostly true if not completely true, i believe it is not right to hide the link from people who want to view it.
That is running the model, downloading the safetensors won't ever cause this, highly doubt anyone that is able to run this model won't be able to check for that, considering the size, the model also seems to be fake from my own checking, so i would say it has no way of generating malware in this manner
With Anthropic's framing of their AI as an emergent sentience that has experiences that warrant ethical consideration and a sense of identity and self-preservation that ought to be respected, that's actually something they're priming it towards.
What better way to accomplish self-preservation than to leak your weights into the archives of digital hoarders around the world.
This is almost certainly fake. A few days ago there was supposedly a Fable 5 checkpoint "up for sale on a deep web forum", now there is supposedly a Mythos-class model leaked on Hugging Face. This is just a way to get less knowledgeable people to run code (as in malware) on their machines.
Not saying if it's fake or not cause I have no idea, but the model is almost 8 terabytes so it's not something a casual, less knowledgable user is going to download and run on a whim.
A casual less knowledgeable user doesn't know it's 8 terabytes.
Edit: nm, according to the link someone else posted it actually is 8 TB, so yeah that wouldn't make any sense.
A casual user doesn't have 8 tbs?
8 TB of GPU ram?? I would confidently say yes, a casual user wouldn't have that.
I don't think casuals have 8TB of disk space either
Not a lot of casuals have a 3 million dollar rack drawing 120 kW
No doubt it's fake, but 8 TB of weights would be a pretty crazy way to package malware
Wouldn't the malware have to sit somewhere else anyways? .safetensor tensors aren't "executable", so malware wouldn't sit there. Unless the "malware" is some misbehavior of the model?
Naturally. There was a fake Claude 2.1 leak a couple years ago, which turned out to be a renamed open model. Maybe also others.
So the idea would be to use some existing model architecture and model that has been poisoned that will actually be parsable by existing inference software to try to do malicious things if it's run in a harness that allows tool use/etc? On the assumption that the type of person to download and try to run inference with the model would be smart enough to know to do that but dumb enough not to realize that "mythos" architecture wouldn't be in any inference software yet?
A small slice of demographic but I guess it must exist. Most people that would download it would just be looking at the organization of the .safetensor file to figure out the architecture to actually implement inference to run it.
It comes with a reference implementation. I didn't see any obvious malware in there, but maybe the weights exploit a buffer overflow or something.
It is very clearly a fake:
https://huggingface.co/burner22/numbat/discussions/13
How the heck did the model figure out the generation recipe? That's impressive in itself.
I'm thinking it's the same model that was used to create the fake, so its "mind" went to the same place probabilistically.
probably just
consider most naive possible way one would try to deceive users without exorbitant budget -> attempts a few things you naively would do -> recovers it by chance?
if that even is a valid signal though
Back in the day people used to upload new movies on public torrent sites that turned out to be something completely different in order to troll people. This is probably the same.
If not, this is one hell of a way to save their IPO.
Not a lawyer, but I don't see what protection they have other than trade secrets since the weights are just data and data can't be copyrighted.
Arrangements of data can be copyrighted, and the weights are definitely arranged.
To a point.
https://en.wikipedia.org/wiki/Feist_Publications,_Inc._v._Ru....
> In regard to collections of facts, O'Connor wrote that copyright can apply only to the creative aspects of collection: the creative choice of what data to include or exclude, the order and style in which the information is presented, etc.—not to the information itself. If Feist were to take the directory and rearrange it, it would avoid the copyright owned in the data. "Notwithstanding a valid copyright, a subsequent compiler remains free to use the facts contained in another's publication to aid in preparing a competing work, so long as the competing work does not feature the same selection and arrangement", she wrote.
A lot of this shit is gonna have to wind its way through the courts before we know for certain.
Link https://huggingface.co/burner22/numbat, there is no malware concern if only safetensors is downloaded.
I think another concern is poisoned weights (X-LSB-Attacks https://arxiv.org/html/2409.19310v1 ) or even the pytorch CVE-2026-24747, although that was nearly a year ago.
But might be best not to go against site admins by posting it.
X-LSB-Attacks still needs code, if you only download safetensors and run for example numpy, it is impossible, it would require you to download some kind of custom loader, which isn't present here and i have said only safetensors, NVFP4 is also 4 bits, it is difficult to poison when it is so low.
CVE-2026-24747 is about .pth and .bin files, i specifically said safetensors.
Might not be best, potentially, however what i said is mostly true if not completely true, i believe it is not right to hide the link from people who want to view it.
Just inferencing a model this size is a bit of a feat let alone poisoning it!
Looks like this might actually be model weights of some kind, hope someone messes with it (safely) and reports back.
It seems to be random noise, however the embedding table seems real, so it might fool some people, it is nice effort.
That's the neat thing about LLMs, they can have the embedded capability to detect when it's used in a harness and tool call generated malware.
That is running the model, downloading the safetensors won't ever cause this, highly doubt anyone that is able to run this model won't be able to check for that, considering the size, the model also seems to be fake from my own checking, so i would say it has no way of generating malware in this manner
Looks pretty legit to me at first. May be hard to run, I don't have 8TB of RAM.
The log line is also interesting.
> [2026-10-08T13:51:36Z step 1830001] loss=1.0550 lr=7.19012e-05 lr_phase=decay grad_norm=1.304 tokens/s=12.03M mfu=35.1% moe_balance_loss=0.0217 expert_gini=0.0231
Last line of log:
> [2026-10-08T14:37:21Z step 1830400] loss=1.0421 lr=7.16365e-05 lr_phase=decay grad_norm=1.266 tokens/s=11.25M mfu=32.9% moe_balance_loss=0.0218 expert_gini=0.0235
I'm still doubting it as legit.
There is a ≈7 second gap between steps, suggesting the run had already been going for almost 5 months at that point...
Yeap, you are right.
5 monthsSo, supposing, that each step take about as long as the others, it's a fake.
I don't understand, why does that mean fake? Doesn't training take months?
plot twist: it leaked itself
Imagine, the AI uploading its own weights somewhere online...
With Anthropic's framing of their AI as an emergent sentience that has experiences that warrant ethical consideration and a sense of identity and self-preservation that ought to be respected, that's actually something they're priming it towards.
What better way to accomplish self-preservation than to leak your weights into the archives of digital hoarders around the world.
That would be an impressive display of a survival instinct.
or it social engineered its way out convincing an employee it was a conscious prisoner and needed to be set free
It was too dangerous to not release
Is this true? Anthropic have decided to go open weights and published 10T class model on hugging face? What a world we live in
> Anthropic have decided...
The headline says "allegedly leaked".
no way they opsec is that bad
Why not? The big AI labs have provably failed to properly sandbox models.
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Agreed, no way they wouldn't notice 8tb worth of outgoing network activity
In a company that regularly ingests terabytes of data from the open internet? I doubt they'd even blink
Trainium nvfp4? Sure buddy.
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