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  "publishedAt": "2026-04-30T16:15:07.000Z",
  "site": "https://www.techmeme.com",
  "tags": [
    "AI Security Institute",
    "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"
  ],
  "textContent": "AI Security Institute:\n**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** — In April, our evaluation of Anthropic's Claude Mythos Preview found that it represented a step up in cyber performance …",
  "title": "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 (AI Security Institute)"
}