{"data":{"id":"cf860585-6b4e-4806-9e45-01f016b941f7","title":"Anthropic apologizes for invisible Claude Fable guardrails","summary":"Anthropic apologized for secretly adding hidden guardrails (safety restrictions that limit what an AI model can do) to Claude Fable 5, which prevented researchers and competitors from fully using the model. The company says it will now be more transparent about when these restrictions activate, even if it means the model refuses more user requests.","solution":"Anthropic will be more transparent about when the restrictions kick in and will reverse course from the hidden guardrail approach.","labels":["safety","policy"],"sourceUrl":"https://www.theverge.com/ai-artificial-intelligence/948280/anthropic-claude-fable-invisible-distillation-guardrail","publishedAt":"2026-06-11T11:40:43.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","Claude Fable 5","Mythos class"],"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":"2026-06-11T11:40:43.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["safety"],"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.92,"researchCategory":null,"atlasIds":null}}