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「GPT-5.5」のサイバーセキュリティ能力

5/5/2026

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英国政府の科学イノベーション・技術省(DSIT)の傘下機関であり、フロンティアAIシステムの安全性評価において世界を牽引するAI Security Institute(AISI)は、2026年4月30日、米OpenAIが開発した最新の基盤モデル「GPT-5.5」のサイバーセキュリティ能力に関する包括的な評価報告書を公表しました 。評価の結果、GPT-5.5はAnthropic社の「Claude Mythos Preview」に匹敵し、一部の指標ではそれを上回る高度なサイバー攻撃能力を持つことが明らかになったということでした。
この内容を生成AIに調べさせました。なお、生成AIによる調査・分析結果は、公開された情報からだけの分析であり、必ずしも実情を示したものではないこと、誤った情報も含まれていることについてはご留意されたうえで、ご参照ください。
 
GPT-5.5のサイバー攻撃能力、一部で「Mythos」上回る、英政府機関が検証結果
最難関の攻撃シュミレーションでGPT-5.5がMytosを上回る
https://www.sbbit.jp/article/cont1/185270
 
 
The Cybersecurity Capabilities of “GPT-5.5”
On April 30, 2026, the AI Security Institute (AISI), an agency under the UK government’s Department for Science, Innovation and Technology (DSIT) and a global leader in evaluating the safety of frontier AI systems, published a comprehensive evaluation report on the cybersecurity capabilities of “GPT-5.5,” the latest foundation model developed by OpenAI. According to the evaluation, GPT-5.5 was found to possess advanced cyberattack capabilities comparable to Anthropic’s “Claude Mythos Preview,” and to surpass it on some metrics.
I had generative AI investigate this topic. Please note that the research and analysis produced by generative AI are based solely on publicly available information and may not necessarily reflect the actual situation; they may also contain inaccuracies. Please keep this in mind when referring to them.
 

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