{"data":{"id":"01a3bd1a-c1ef-43ef-8e13-6d7fc2488912","title":"Anthropic's Project Glasswing - restricting Claude Mythos to security researchers - sounds necessary to me","summary":"Anthropic released Claude Mythos, a new AI model with exceptionally strong cybersecurity research abilities, but restricted access to only a small group of preview partners through Project Glasswing instead of releasing it publicly. The model can autonomously develop complex exploits (attacks that chain multiple vulnerabilities together to break into systems), finding thousands of high-severity vulnerabilities in major operating systems and web browsers, which is a major leap forward compared to older models like Claude Opus 4.6.","solution":"N/A -- no mitigation discussed in source.","labels":["security","policy"],"sourceUrl":"https://simonwillison.net/2026/Apr/7/project-glasswing/#atom-everything","publishedAt":"2026-04-07T20:52:54.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","Claude Mythos","Claude Opus 4.6"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"patchAvailable":null,"disclosureDate":"2026-04-07T20:52:54.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"advanced","impactType":["integrity"],"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.92,"researchCategory":null,"atlasIds":null}}