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[ARTICLE · art-36561] src=the-decoder.com ↗ pub= topic=large-language-models verified=true sentiment=↑ positive

OpenAI says new GPT-5.5-Cyber outperforms Anthropic's Mythos on cybersecurity benchmark

OpenAI announced that its new GPT-5.5-Cyber model outperforms Anthropic's Mythos on a cybersecurity benchmark, as part of an expanded Daybreak initiative that includes an updated Codex Security plugin and a partner network of over 25 security firms and several governments, shifting focus from vulnerability discovery to automated patching.

read1 min views6 publishedJun 23, 2026

OpenAI is expanding its Daybreak cybersecurity initiative with an updated Codex Security plugin, the full GPT-5.5-Cyber model, and a partner network with more than 25 security firms and several governments. The focus shifts from finding vulnerabilities to patching them automatically.

The article OpenAI says new GPT-5.5-Cyber outperforms Anthropic's Mythos on cybersecurity benchmark appeared first on The Decoder.

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