It's pretty clear at this point that Mythos' capability to discover and exploit zero-day vulnerabilities at scale is but an incremental improvement over existing models like the ones available to OpenAI's Plus/Pro subscribers.

Anthropic tries to create marketing hype around Mythos using two psychological tricks.

1. Put large numbers in the headlines.

"Mythos discovered 271 vulnerabilities in Firefox" makes the model seem extremely capable to the uninitiated.

But it's actually meaningless as a measure of capability _improvement_.

Anthropic gave away $100mil specifically as Mythos credits to these projects and companies (that's $2.5mil per project). Spending the same exorbitant amount of compute analyzing the same codebases in an older model like GPT 5.x Pro would have turned up 260 of these vulnerabilities, or could even have turned up more than 271 ones.

No need to speculate, since this is exactly what we saw in the few code bases where we have such comparisons (like in the curl codebase). Supposedly weaker models, working with a much lower budget, turned up dozens of vulnerabilities. Mythos turned up only one, which ended up as a low severity CVE.

2. Do the whole "too dangerous to release" shtick. This is one of Dario Amodei's favorite moves. When he was vice president of research at OpenAI, he declared GPT-3 (which wasn't able to produce coherent text beyond 3-4 sentences at the time) too dangerous [1] as well.

Long story short, it's the ChatGPT 4.5 situation again: a company trained a model that's too slow and expensive, but not much more capable than what came before. It therefore requires these marketing stunts.

[1] https://www.itpro.com/technology/artificial-intelligence-ai/...

I work for a company that has been using Mythos for vulnerability detection in our software. The results we're getting are revolutionary to the point that our software security teams are heavily overloaded addressing the deluge of thousands of real bugs/vulnerabilities and design flaws across our billions of lines of code.

For comparison, we are invested heavily the the AI space to the point where Anthropic is one of our competitors. We were already using state of the art models to find flaws in our code, but Mythos was just so much better at finding real vulnerabilities it's not even funny.

>Do the whole "too dangerous to release" shtick.

One aspect that isn't really discussed much in this context is how to wrap one's head around the corporate risk with models of ever increasing capability. It might not be too dangerous to society, but it could be too dangerous to Anthropic.

I couldn't agree more. I think the recent moves to partner with xAI and Amazon are proof that they desperately need more compute and are doing everything possible to get it.

I'm fairly certain Amodei believes the "too dangerous to release" hype himself. Even if it's just an incremental improvement, better than getting frog-boiled by repeated 20% improvements until someone builds bioweapons in their backyard.

Also, slightly stretching the definition of terms consecutively, so the multiplicative meaning is really far from the truth. For example, 271 vulnerabilities were really mostly bugs - generally incorrect states, but which almost never led to any exploit.

You're not really responding to the piece at all.

I find it interesting that Mythos was announced the same day that GLM overtook opus4.6 in capability. To me this seems like a careful attempt to cool demand for opensource models which are about to take the overall lead.

I don't get it. If the older / smaller models are almost as good as Mythos, that sounds like the opposite of comforting.

> an incremental improvement

I've had to reboot my systems quite a bit more than an incremental improvement would suggest this week

> It's pretty clear at this point that Mythos' capability to discover and exploit zero-day vulnerabilities at scale is but an incremental improvement over existing models like ChatGPT Plus/Pro.

I'm skeptical of AI takes by someone who thinks there's a model called chatgpt plus. Spend more time working with the current systems!

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