{"data":{"id":"01a3bd1a-c1ef-43ef-8e13-6d7fc2488912","title":"Anthropic's Project Glasswing - restricting Claude Mythos to security researchers - sounds necessary to me","summary":"Anthropic has withheld general release of Claude Mythos, a general purpose model, and is giving access only to a restricted set of preview partners under Project Glasswing. Anthropic says Mythos Preview has found thousands of high-severity vulnerabilities, including some in every major operating system and web browser. In internal tests it developed working exploits 181 times, compared with two successes out of several hundred attempts for Claude Opus 4.6.","solution":"N/A -- no mitigation discussed in source.","labels":["security","safety","industry"],"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,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Claude Mythos","Claude Mythos Preview","Claude Opus 4.6","Project Glasswing"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"epssCheckedAt":null,"kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":"2026-04-07T20:52:54.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":null,"aiComponentTargeted":null,"llmSpecific":true,"classifierConfidence":0.9,"researchCategory":null,"atlasIds":null}}