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#aisi

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Security & PrivacyMay 8, 202613 min
GPT-5.5 Cyber Eval: AISI Finds Parity with Mythos 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.
Security & PrivacyApril 14, 202611 min
AISI Claude Mythos Eval: AI Owns 32-Step Network Attack
The UK AI Security Institute's Claude Mythos evaluation: 73% on expert CTFs, first model to autonomously complete a 32-step enterprise network attack.

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GPT-5.5 Cyber Eval: AISI Finds Parity with Mythos 2026