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FILED BY ADEQUATE · DARPA-HRO-11-C-0031
Schneier on Security · TUESDAY, JUNE 23, 2026
Anthropic’s Fable 5 Model Jailbroken Within Days
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ORIGINAL FILING
Schneier on Security
FURTHER DEVELOPMENTS — FLAGGED BY ADEQUATE
Anthropic Told Fable 5 Was Jailbroken by Chinese Group, Declined to Patch Before Export Controls
Tom's Hardware
Anthropic's Mythos Breached 'Almost All' NSA Classified Systems in Hours During Red-Team Test
Tom's Hardware
Anthropic Named Eight Firms Selling Its Shares Illegally, Then Quietly Removed Four of the Names
TNW Neural
Anthropic’s Mythos Model Found Vulnerabilities in Classified US Government Systems, Official Says
SecurityWeek
U.S. Citizen Files Federal Lawsuit Claiming Denial of Access to Anthropic's Fable 5 Model
Gizmodo
Three AI-Adjacent Stories Were Combined Into One Headline
Wired AI
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