A UK government agency, AISI, identified a universal jailbreak in OpenAI's GPT-5.5 model during a six-hour red-teaming exercise. While OpenAI updated its safeguards, a configuration issue prevented AISI from verifying the effectiveness of the final version. Separately, AISI noted progress towards a jailbreak for Anthropic's Claude Fable 5, though Anthropic claims extensive testing found no universal jailbreaks. AI
IMPACT Identified jailbreaks in advanced models like GPT-5.5 highlight ongoing safety challenges and the need for robust security measures.
RANK_REASON The cluster discusses a safety evaluation and red-teaming of AI models, specifically identifying vulnerabilities. [lever_c_demoted from research: ic=1 ai=1.0]
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