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Anthropic's Mythos model accessed by unauthorized users, Bloomberg News reports
yahoo ^ | Tue, April 21, 2026 at 2:49 PM PDT | Reuters

Posted on 04/21/2026 7:31:02 PM PDT by BenLurkin

A handful of users in a private online forum gained access to Mythos on the same day that Anthropic first announced ‌a plan to ⁠release the model...

The group has been using Mythos regularly since then, though not for ​cybersecurity purposes...

Announced on April 7, Mythos is being deployed as part of ‌Anthropic's "Project Glasswing," a controlled ​initiative under which select organizations ​are permitted ​to use the unreleased Claude Mythos ‌Preview model for defensive ​cybersecurity.

Mythos is ​a powerful AI model that has sparked concerns among regulators about its unprecedented ​ability to ‌identify digital security vulnerabilities and potential for ​misuse.

(Excerpt) Read more at yahoo.com ...


TOPICS: Computers/Internet
KEYWORDS: anthropic; bloomberg; cybersecurity; cyberwarfare; mythos

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1 posted on 04/21/2026 7:31:02 PM PDT by BenLurkin
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To: BenLurkin
Claude Code Source Leaked via npm Packaging Error, Anthropic Confirms
2 posted on 04/21/2026 7:44:05 PM PDT by yesthatjallen
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To: yesthatjallen

How does a company that specializes in cyber-security manage to lose not just one app, but two?


3 posted on 04/21/2026 7:45:56 PM PDT by BenLurkin (The above is not a statement of fact. It is opinion or satire. Or both.)
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To: BenLurkin

I find it curious how this occurs at the same time its experiencing a significant dodgy patch with the U.S. government, specifically the Department of Defense (DoD) about its imposed guardrails.


4 posted on 04/21/2026 8:48:46 PM PDT by captmar-vell
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To: BenLurkin

Since Mythos is being coded by 80% Indians here in the USA you can bet that the source code is available on the streets of Mumbai on a thumb drive right now....

They just don’t have the electricity or silicone to pull it off.


5 posted on 04/21/2026 9:24:04 PM PDT by jroehl (And how we burned in the camps later - Aleksandr Solzhenitsyn - The Gulag Archipelago)
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To: BenLurkin

Bfl


6 posted on 04/21/2026 9:40:18 PM PDT by RoosterRedux ( )
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To: jroehl

“They just don’t have the electricity or silicone to pull it off.”

That is because India is a parasitic civilization and has to live off others like a fungus.


7 posted on 04/21/2026 9:46:11 PM PDT by wildcard_redneck ( Neocons in love with the Ukraine War hate how long the Iran War is taking..........)
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To: BenLurkin

Toothpaste. Tube. Some assembly required.

Oh wait. Never mind.


8 posted on 04/21/2026 9:52:12 PM PDT by dayglored (This is the day which the LORD hath made; we will rejoice and be glad in it. Psalms 118:24)
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To: wildcard_redneck

They are running all of our computer systems now. So there is that.


9 posted on 04/21/2026 10:05:41 PM PDT by jroehl (And how we burned in the camps later - Aleksandr Solzhenitsyn - The Gulag Archipelago)
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To: BenLurkin

One day in the not-so-distant future, AI will figure out how to take down the entire Internet.

Pleasant dreams, everyone!


10 posted on 04/21/2026 10:21:14 PM PDT by dfwgator ("I am Charlie Kirk!")
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To: BenLurkin
I asked Claude to tell about Mythos and why it is so powerful. Here's the result:

This is a significant and fast-moving story. Here's what the reporting tells us:

What Mythos Is

Mythos is Anthropic's latest AI model, announced on April 7. Anthropic made the unusual decision to refuse a public release — the first time a major developer has deemed a system too dangerous for the public since OpenAI briefly withheld GPT-2 in 2019. Scientific American

Why It's Powerful

Mythos is built to think like a senior software engineer. It can detect hidden flaws in code and exploit them at machine speed. It scored 73% on expert-level hacking tasks in independent testing by the UK's AI Security Institute — tasks no previous AI model could complete at all. Technology Org

In tests, it found critical faults in every widely used operating system and web browser. Of those vulnerabilities, 99% have not yet been patched — and Anthropic has disclosed only a fraction of what it says it has found. Scientific American

How Access Is Being Controlled

Anthropic provided Mythos to more than 40 companies and organizations who are now testing it and working to shore up their systems, rather than releasing it publicly. Axios This restricted access program is called "Project Glasswing" and includes Microsoft, Google, Apple, and JPMorgan Chase. Technology Org

The Security Complications

An unauthorized group reportedly gained access to Mythos through a third-party vendor, making "an educated guess about the model's online location based on knowledge of the format Anthropic has used for other models." TechCrunch

Notably, CISA — the country's top cyber defense agency — is not among the organizations with access, even as the NSA and other government agencies are using it. Axios

The bottom line: Mythos appears to represent a genuine capability threshold crossing — an AI that can do offensive cybersecurity work at a level that previously required elite human expertise. That's what has governments and financial institutions rattled.


11 posted on 04/22/2026 1:34:32 AM PDT by RoosterRedux ( )
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To: RoosterRedux

This AI business sounds more & more dangerous every time I hear about it. With what’s already known about it, it would seem to me that it should be outlawed.


12 posted on 04/22/2026 4:52:44 AM PDT by oldtech
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To: oldtech
As Trump has said, AI is the new arms race, and the country that develops the most powerful AI will rule the world.

It may lead to a great deal of trouble, but we can be sure that China will not outlaw it–and would use it to destroy the US and the free world.

Like it or not, it is now a matter of national security.

13 posted on 04/22/2026 4:58:32 AM PDT by RoosterRedux ( )
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To: BenLurkin
How does a company that specializes in cyber-security manage to lose not just one app, but two?

Create a problem and then come to the rescue calling to have a solution?


14 posted on 04/22/2026 5:14:35 AM PDT by Sirius Lee ("Never argue with a fool, onlookers may not be able to tell the difference.)
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