{"data":{"id":"ab6bf26d-d7e4-40d0-88a4-e02971d1c5eb","title":"Anthropic Expands Mythos 5 Access to More Defenders, Unveils $35M Open Source Fund","summary":"Anthropic is expanding access to Mythos 5, an advanced AI model designed to help cybersecurity teams find and fix vulnerabilities, through partner integrations and a new $35 million open source funding program. Rather than giving defenders direct access to the model (which could be misused), Anthropic restricts interaction to specific defensive outputs, such as security patches and vulnerability alerts, using purpose-built interfaces with abuse-prevention checks. This approach aims to give security teams powerful AI capabilities while minimizing risks from malicious actors gaining unrestricted access.","solution":"Anthropic implements several safeguards described in the source: (1) Purpose-built interfaces that return only defined outputs like patches or security alerts, with abuse-prevention checks to keep the model within scope; (2) Claude Security, which scans code and surfaces findings with CWE (Common Weakness Enumeration, a classification system for software vulnerabilities) categories, confidence and severity ratings, and suggested fixes that must be implemented through Claude Code and approved by a human before deployment; (3) The Cyber Verification Program, which provides vetted organizations reduced safeguards on Claude Opus and Sonnet models for authorized security work; (4) Project Glasswing, which gives early access to a small group of organizations to find and fix vulnerabilities before capabilities become widely available or fall into malicious hands.","labels":["security","policy"],"sourceUrl":"https://www.securityweek.com/anthropic-expands-mythos-5-access-to-more-defenders-unveils-35m-open-source-fund/","publishedAt":"2026-08-24T07:18:58.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","Claude","Claude Mythos 5","Claude Security","Claude Enterprise","Claude Code","Claude Opus","Claude Sonnet"],"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":"2026-08-24T07:18:58.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity","safety"],"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.92,"researchCategory":null,"atlasIds":null}}