LmCast :: Stay tuned in

Anthropic’s restricted Claude Mythos model may be coming to Claude Code

Recorded: May 26, 2026, 1:16 p.m.

Original Summarized

Anthropic’s restricted Claude Mythos model may be coming to Claude Code

News

Featured
Latest

Ghost CMS SQL injection flaw exploited in large-scale ClickFix campaign

Laravel Lang packages hijacked to deploy credential-stealing malware

Netherlands seizes 800 servers of hosting firm enabling cyberattacks

Ubiquiti patches three max severity UniFi OS vulnerabilities

Microsoft Defender can now automatically isolate hacked endpoints

Webinar: Too many tools are slowing network incident response

This lifetime PDF editor is just $65 with code SAVE5 through 5/31

CISA orders feds to patch actively exploited Drupal vulnerability

Tutorials

Latest
Popular

How to access the Dark Web using the Tor Browser

How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11

How to use the Windows Registry Editor

How to backup and restore the Windows Registry

How to start Windows in Safe Mode

How to remove a Trojan, Virus, Worm, or other Malware

How to show hidden files in Windows 7

How to see hidden files in Windows

Webinars
Downloads

Latest
Most Downloaded

Qualys BrowserCheck

STOPDecrypter

AuroraDecrypter

FilesLockerDecrypter

AdwCleaner

ComboFix

RKill

Junkware Removal Tool

Deals

Categories

eLearning

IT Certification Courses

Gear + Gadgets

Security

VPNs

Popular

Best VPNs

How to change IP address

Access the dark web safely

Best VPN for YouTube

Forums
More

Virus Removal Guides
Startup Database
Uninstall Database
Glossary
Send us a Tip!
Welcome Guide

HomeNewsArtificial IntelligenceAnthropic’s restricted Claude Mythos model may be coming to Claude Code

Anthropic’s restricted Claude Mythos model may be coming to Claude Code

By Mayank Parmar

May 25, 2026
01:07 PM
0

Anthropic appears to be preparing for the public rollout of "Mythos," which was announced in April as a restricted model that poses major security risks to private and public software.
On April 7, Anthropic announced the Mythos in early preview and called it a new frontier model with strikingly advanced capabilities in computer security tasks.
Anthropic said the Mythos model shows major improvements in code reasoning and autonomy, far above its current flagship model, Opus 4.7.
Coding improvements aren't new for AI models, but in the case of Mythos, Anthropic found that the model can automatically develop functional cyberattacks at a highly professional level.
The company also claimed its rollout poses a severe risk to global digital infrastructure.
"The advantage will belong to the side that can get the most out of these tools," Anthropic warned.
"In the short term, this could be attackers, if frontier labs aren’t careful about how they release these models. In the long term, we expect it will be defenders who will more efficiently direct resources and use these models to fix bugs before new code ever ships."
To prevent attackers from exploiting a massive volume of unpatched vulnerabilities in popular apps, such as Firefox, Anthropic decided against the public rollout of the Mythos model until it prepared a powerful guardrail system.
It looks like Anthropic may have developed a strong guardrail system, as Claude Code and Claude Security now have references to the Mythos model.
In fact, some users briefly noticed the toggle to enable Mythos in the public version of Claude Code before it was taken offline.
 

The model is called claude-mythos-1-preview, and it also briefly appeared in the public version of Claude Security.
This confirms that Anthropic is preparing the model for public rollout, but it's unclear whether it'll be available across all subscription tiers.
Anthropic says it's working with companies on finding potential AI-driven exploits
Anthropic has confirmed it's working on a new project called "Glasswing," where the AI startup collaborates with other companies to secure the world's most critical software from potential AI-driven exploits.
This initiative uses the unreleased Claude Mythos Preview, and it has already managed to help up to 50 organizational partners.

Anthropic showed off a dashboard containing open-source vulnerabilities. This has vulnerabilities of all severities found by Mythos Preview.
Mythos model managed to uncover 10,000 high- or critical-severity vulnerabilities in its first month alone, which explains why Anthropic has been holding off its public release.
Anthorpic currently offers Claude Opus 4.7, Opus 4.6, Opus 4.5, Sonnet 4.6, and Haiku 5.5.

The Validation Gap: Automated Pentesting Answers One Question. You Need Six.

Automated pentesting tools deliver real value, but they were built to answer one question: can an attacker move through the network? They were not built to test whether your controls block threats, your detection rules fire, or your cloud configs hold.This guide covers the 6 surfaces you actually need to validate.
Download Now

Related Articles:
Claude Code source code accidentally leaked in NPM packagePaid AI Accounts Are Now a Hot Underground Commodity ChatGPT rolls out new $100 Pro subscription to challenge ClaudeClaude Code leak used to push infostealer malware on GitHubFBI warns of Kali365 phishing service targeting Microsoft 365 accounts

AI
Anthropic
Claude
Claude Code
Claude Mythos
Cybersecurity

Mayank Parmar
Mayank Parmar is an technology entrepreneur who is currently pursuing an MBA. At BleepingComputer, he covers technology news with a strong focus on Microsoft and Windows-related stories. He is always poking under the hood of Windows, looking for the latest secrets to reveal.

Previous Article
Next Article

Post a Comment Community Rules

You need to login in order to post a comment
Not a member yet? Register Now

You may also like:

  Upcoming Webinar

Popular Stories

Laravel Lang packages hijacked to deploy credential-stealing malware

Italy disrupts CINEMAGOAL piracy app that stole streaming auth codes

Ghost CMS SQL injection flaw exploited in large-scale ClickFix campaign

Sponsor Posts

Patch management isn't enough. See why privilege is defining security risk today.

Overdue a password health-check? Audit your Active Directory for free

33% Rise in Healthcare Credential Theft in 2025: What you need to know

Protect Your Business from Ecommerce Fraud

  Upcoming Webinar

Follow us:

Main Sections

News
Webinars
VPN Buyer Guides
SysAdmin Software Guides
Downloads
Virus Removal Guides
Tutorials
Startup Database
Uninstall Database
Glossary

Community

Forums
Forum Rules
Chat

Useful Resources

Welcome Guide
Sitemap

Company

About BleepingComputer
Contact Us
Send us a Tip!
Advertising
Write for BleepingComputer
Social & Feeds
Changelog

Terms of Use - Privacy Policy - Ethics Statement - Affiliate Disclosure

Copyright @ 2003 - 2026 Bleeping Computer® LLC - All Rights Reserved

Login

Username

Password

Remember Me

Sign in anonymously

Sign in with Twitter

Not a member yet? Register Now


Reporter

Help us understand the problem. What is going on with this comment?

Spam

Abusive or Harmful

Inappropriate content

Strong language

Other

Read our posting guidelinese to learn what content is prohibited.

Submitting...
SUBMIT

Anthropic is preparing for the public release of the restricted Claude Mythos model, which was previously announced in April as a model with advanced capabilities in computer security tasks. Anthropic indicated that the Mythos model demonstrates significant improvements in code reasoning and autonomy, surpassing even their flagship Opus 4.7 model. This advancement is particularly noted because the model has shown the ability to automatically develop functional cyberattacks at a highly professional level, raising concerns regarding the potential risks to global digital infrastructure. Anthropic cautioned that the advantage derived from these tools would likely belong to those who can utilize them most effectively, suggesting a potential short-term risk that attackers could leverage these systems, while emphasizing a long-term goal of using these models to improve defensive measures.

To mitigate these severe risks, Anthropic decided against the immediate public rollout of Mythos until a robust guardrail system was established. Evidence suggests that such a system is being developed, as references to the Mythos model are now present in Claude Code and Claude Security, and some users briefly observed an option to enable Mythos in the public version of Claude Code before it was taken offline. The model is internally designated as claude-mythos-1-preview and also briefly appeared in Claude Security.

Furthermore, Anthropic is actively engaged in securing software against AI-driven exploits through a new initiative named Glasswing. This project involves collaboration with other companies to protect the world's most critical software from such vulnerabilities, utilizing the unreleased Claude Mythos Preview. This collaborative effort has already engaged up to fifty organizational partners. The utility of the Mythos Preview was demonstrated when Anthropic presented a dashboard displaying open-source vulnerabilities, indicating that the model alone managed to uncover ten thousand high- or critical-severity vulnerabilities within its first month, which served as the basis for the decision to delay the public release. Anthropic currently offers various models, including Claude Opus 4.7, Opus 4.6, Opus 4.5, Sonnet 4.6, and Haiku 5.5. The context surrounding these developments highlights the ongoing tension between advancing artificial intelligence capabilities and ensuring the security of the software ecosystem.