{"data":{"id":"36c4d432-8953-436d-b160-ff5b3d0ece2a","title":"Anthropic Restores Claude Fable 5 After U.S. Lifts Jailbreak-Linked Export Controls","summary":"Anthropic restored access to Claude Fable 5 worldwide after the U.S. lifted export controls (restrictions on who can use a technology) that had been imposed for two and a half weeks following the discovery of a jailbreak (a prompt that tricks an AI into bypassing its safety rules). To address the security concern, Anthropic trained a new safety filter called a classifier that blocks the specific jailbreak technique in over 99% of attempts, while automatically routing blocked requests to a weaker model and notifying users.","solution":"Anthropic trained a new safety filter called a classifier that watches for the exact jailbreak technique and blocks it. The company says it now stops that technique in more than 99% of tries as of the June 30 write-up. Blocked requests get handed to the weaker Opus 4.8 model instead, and the user is told.","labels":["security","policy"],"sourceUrl":"https://thehackernews.com/2026/07/anthropic-restores-claude-fable-5-after.html","publishedAt":"2026-07-01T06:46:17.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":["jailbreak"],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic","OpenAI","Amazon","Google","Microsoft"],"affectedVendorsRaw":["Anthropic","Claude Fable 5","Claude Mythos 5","Claude Opus 4.8","OpenAI","GPT-5.5","Amazon","Microsoft","Google","Kimi K2.7"],"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":"2026-07-01T06:46:17.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["safety"],"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.92,"researchCategory":null,"atlasIds":null}}