{"data":{"id":"0c45ab01-d6fb-4496-8de1-6788d939860a","title":"Anthropic Offers Mythos Upgrade for Cyber Partners and a ‘Safe’ Version for the Rest of You","summary":"Anthropic released two new AI models: Claude Mythos 5 (limited to industry partners and government collaborators) and Claude Fable 5 (publicly available). Because Mythos 5 can design hacking tools to find software vulnerabilities, Claude Fable 5 includes guardrails (safety restrictions built into the system) that block questions about cybersecurity, biology, and chemistry by routing them to an older, less capable model instead, while Anthropic works on more precise safeguards for future releases.","solution":"Claude Fable 5 uses guardrails at launch that block the model from answering many user questions related to cybersecurity, biology, and chemistry, rerouting these requests to Claude Opus 4.8 (an older AI model). Requests suspected of being distillation attempts (training a smaller AI model using responses from a larger one) are also rerouted to Claude Opus 4.8. Anthropic states it aims to make its classifiers more precise over time, but Penn notes 'this was the only safe way the company could release the model broadly at this time.'","labels":["safety","security"],"sourceUrl":"https://www.wired.com/story/anthropic-releases-claude-fable-5-mythos-5/","publishedAt":"2026-06-09T17:00:46.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","Claude Fable 5","Claude Mythos 5","Claude Opus 4.8"],"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":"2026-06-09T17:00:46.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["safety","integrity"],"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.92,"researchCategory":null,"atlasIds":null}}