Articles from www.aisi.gov.uk

Articles from www.aisi.gov.uk

Mythos Preview is the first AI model to complete both of AISI's cyber ranges, which measure models' cyberattack capabilities; GPT-5.5 solved only one of them (www.aisi.gov.uk)
20 hours ago AI

Cybersecurity analysis: GPT-5.5 reaches a similar level of performance as Mythos Preview and is the second model to solve a multi-step cyberattack simulation (www.aisi.gov.uk)
14 days ago

Cybersecurity analysis: Claude Mythos Preview had a 73% success rate on expert-level capture-the-flag challenges, which no model could finish before April 2025 (www.aisi.gov.uk)
2026-4-14

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