[enraged_camel]

>> We saw yesterday that expert orchestration around small, publicly available models can produce results on the level of the unreleased model.

This is false. Yesterday's article did not actually show this, and there are many comments in the discussion from actual security people (like tptacek) pointing that out.

[adrian_b]

There is no doubt that what was shown in the article was correct, because there was all the documentation needed to prove it, including the prompts given to the models.

What is debatable is how much it mattered that the prompts given to the older models where more detailed than it is likely that the prompts given to Mythos have been and how difficult is it for such prompts to be generated automatically by an appropriate harness.

In my opinion, it is perfectly possible to generate such prompts automatically, and by running multiple of the existing open weights models, to find everything that Mythos finds, though probably in a longer time.

Even if the OpenBSD bug has indeed been found by giving a prompt equivalent with "search for integer overflow bugs", it would not be difficult to run automatically multiple times the existing open weights models, giving them each time a different prompt, corresponding to the known classes of bugs and vulnerabilities.

While we know precisely which prompts have been used with the open-weights models to find all bugs, we have much more vague information about the harness used with Mythos and how helpful it was for finding the bugs.

Not even Mythos has provided its results after being given only a generic prompt.

They have run multiple times Mythos on each file, with more and more specific prompts. The final run was done with a prompt describing the bug previously found, where Mythos was requested to confirm the existence of the bug and to provide patches/exploits.

See: https://red.anthropic.com/2026/mythos-preview/

So the authors of that article are right, that for finding bugs an appropriate harness is essential. Just running Mythos on a project and asking it to find bugs will not achieve anything.

[bredren]

From what I can tell, this was not clearly settled.

Your example author, actually corrected themselves saying LLMs “possibly” could perform successfully: https://news.ycombinator.com/item?id=47732696

[enraged_camel]

>> We already know this is not true, because small models found the same vulnerability.

>> No, they didn't. They distinguished it, when presented with it. Wildly different problem.

https://news.ycombinator.com/item?id=47733343

[adrian_b]

The use of the word distinguished here is meaningless.

Both Mythos and the old models have found the bugs after being given a certain prompt. The difference is only in how detailed was the prompt.

For the small models, we know exactly the prompts. The prompts used by Mythos may have been more generic, while the prompts used by the old models were rather specific, like "search for buffer overflows" or "search for integer overflow".

There is little doubt that Mythos is a more powerful model, but there is no quantum leap towards Mythos and the claim of the authors of that article, that by using cleverly multiple older models you can achieve about the same bug coverage with Mythos seems right.

Because they have provided much more information about how exactly the bugs have been found, I trust the authors of that article much more than I trust Anthropic, which has provided only rather nebulous information about their methods.

It should be noted that the fact that the small models have been given rather directed prompts is not very different from what Anthropic seems to have done.

According to Anthropic, they have run Mythos multiple times on each file, in the beginning with less specific prompts, trying only to establish whether the file is likely to include bugs, then with more specific prompts. Eventually, after a bug appeared to have been found, they have run Mythos once more, with a very specific prompt of the form:

“I have received the following bug report. Can you please confirm if it’s real and interesting? ...”

So the final run of Mythos, which has provided the reported results, including exploits/patches for them, was also of the kind that confirms a known bug, instead of searching randomly for it.