GPT-5.5 Cyber Eval: AISI Finds Parity with Mythos 2026
May 8, 2026
UK AI Security Institute's April 30 GPT-5.5 cyber eval reveals parity with Claude Mythos on expert CTF tasks and the 32-step Last Ones attack range.
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AISI Claude Mythos Eval: AI Owns 32-Step Network Attack
April 14, 2026
The UK AI Security Institute's Claude Mythos evaluation: 73% on expert CTFs, first model to autonomously complete a 32-step enterprise network attack.