GoKawiilWe're sharing an update on our efforts to help more teams use frontier capabilities for cyber defense. Claude Mythos 5 is now available in Claude Security, and coming soon to partners' cyber defense tools. We're also launching a $35M fund to help secure open-source software and sharing plans to expand our Cyber Verification Program.
In April, we launched Project Glasswing to put our most capable frontier model, Claude Mythos Preview (and its successor, Claude Mythos 5), in the hands of a small group of organizations securing the world’s most critical software. This gave defenders a window of time to find and fix vulnerabilities ahead of models with similar capabilities becoming generally available or reaching malicious actors.
Our goal has always been to expand Mythos-level defense to as many defenders as we safely can. To do that, we've been working on safety classifiers and safeguards that let us expand access to Mythos-class models without putting their offensive cyber capabilities in the wrong hands. Claude Fable 5 was the first step: it made the model broadly available while blocking dual-use cyber work.
Today, we’re taking the next steps. The riskiest behavior occurs when a user has direct access to a model, where a malicious actor can try to steer it toward harmful uses. But if users can only receive specific outputs, such as a patch for a vulnerability or a security alert, that risk is much lower. The changes we’re announcing give users greater access to the defensive results, while maintaining appropriate guardrails around direct access to the model:
Claude Mythos 5 integration into the tools defenders rely on. We’re working with our cybersecurity technology and services partners to integrate Claude Mythos 5 into the products and services defenders already use to secure their software.
We’re working with our cybersecurity technology and services partners to integrate Claude Mythos 5 into the products and services defenders already use to secure their software. Claude Security scans can now run on Claude Mythos 5. Customers on Claude Enterprise plans can now run our most capable model in Claude Security, using it to scan their codebases for security vulnerabilities and suggest patches.
Customers on Claude Enterprise plans can now run our most capable model in Claude Security, using it to scan their codebases for security vulnerabilities and suggest patches. $35 million in credits for open-source security. Our new Defender Advantage Fund (0xDAF) will provide $35 million in credits to organizations working to patch vulnerabilities in open-source projects, automate parts of the process of scanning and patching open-source software, and experiment with new security approaches.
Our new Defender Advantage Fund (0xDAF) will provide $35 million in credits to organizations working to patch vulnerabilities in open-source projects, automate parts of the process of scanning and patching open-source software, and experiment with new security approaches. Expanding our Cyber Verification Program. The program already gives vetted defenders reduced safeguards on Opus and Sonnet models. In the coming weeks, we will expand this program to include broader dual-use capabilities on Opus and Sonnet, with Mythos-class access to follow.
Our aim remains to help organizations adapt to the pace and demands of cybersecurity as AI models become increasingly powerful. We will continue to develop safeguards, access programs, and community support to make our most capable models safely available to a wide range of people and organizations.
Integrating Mythos into existing cyberdefensive tools
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