Anthropic’s Claude Fable 5 Jailbroken to Generate Stack Exploits

Anthropic launched Claude Fable 5 on June 9, 2026, as the first publicly available model in its new Mythos class, its most capable AI to date, excelling in software engineering, knowledge work, and vision benchmarks. Researcher “Pliny the Liberator” defeats Claude Fable 5’s safety classifiers using multi-agent decomposition,...

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