Anthropic's Mythos-class model allegedly leaked on Hugging Face

It is very clearly a fake:

https://huggingface.co/burner22/numbat/discussions/13

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.

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.

Link https://huggingface.co/burner22/numbat, there is no malware concern if only safetensors is downloaded.

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.

plot twist: it leaked itself

Is this true? Anthropic have decided to go open weights and published 10T class model on hugging face? What a world we live in

no way they opsec is that bad

It was too dangerous to not release

[dead]

[flagged]