Anthropic has unveiled Claude Mythos Preview, a new AI model capable of autonomously identifying zero-day vulnerabilities and developing related exploits across major operating systems and software. This model has already uncovered critical issues in OpenBSD, FFmpeg, and the Linux kernel, with all discovered vulnerabilities reported and patched. The feature is currently available to a select group of partners under Project Glasswing, including major tech and security companies like Cisco, AWS, Microsoft, CrowdStrike, JPMorgan Chase, and Google. Access is provided via the Claude API, Amazon Bedrock, Google Cloud’s Vertex AI, and Microsoft Foundry, and open source maintainers may apply for access through the Claude for Open Source program.
Mythos Preview has already found thousands of high-severity vulnerabilities—including some in every major operating system and web browser. pic.twitter.com/YuW484PVrr
— Anthropic (@AnthropicAI) April 7, 2026
Claude Mythos Preview is not slated for general public release due to its advanced capabilities and associated risks. Instead, Anthropic is offering $100 million in model usage credits to partners and open source communities, along with targeted donations to security foundations. Technical benchmarks highlight a substantial leap over previous models, such as Claude Opus 4.6, particularly in agentic coding and autonomous vulnerability discovery.
MYTHOS BENCHMARKS, OFFICIAL. HOLY MOLY
— Chubby♨️ (@kimmonismus) April 7, 2026
Anthropic cooked!! pic.twitter.com/00ey0SuI75
Anthropic, the company behind this release, is positioning itself as a leader in AI-driven cybersecurity. The company is engaging with government agencies and industry leaders to set safety standards and best practices for the deployment of powerful AI systems in cyber defense. Anthropic’s efforts are directed at both advancing security for critical infrastructure and guiding the broader industry through collaborative initiatives like Project Glasswing.
