{"slug": "openai-says-new-gpt-5-5-cyber-outperforms-anthropic-s-mythos-on-cybersecurity", "title": "OpenAI says new GPT-5.5-Cyber outperforms Anthropic's Mythos on cybersecurity benchmark", "summary": "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.", "body_md": "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.\n\nThe article [OpenAI says new GPT-5.5-Cyber outperforms Anthropic's Mythos on cybersecurity benchmark](https://the-decoder.com/openai-says-new-gpt-5-5-cyber-outperforms-anthropics-mythos-on-cybersecurity-benchmark/) appeared first on [The Decoder](https://the-decoder.com).", "url": "https://wpnews.pro/news/openai-says-new-gpt-5-5-cyber-outperforms-anthropic-s-mythos-on-cybersecurity", "canonical_source": "https://the-decoder.com/openai-says-new-gpt-5-5-cyber-outperforms-anthropics-mythos-on-cybersecurity-benchmark/", "published_at": "2026-06-23 10:43:17+00:00", "updated_at": "2026-06-24 00:06:40.533057+00:00", "lang": "en", "topics": ["large-language-models", "ai-products", "ai-safety"], "entities": ["OpenAI", "GPT-5.5-Cyber", "Anthropic", "Mythos", "Codex Security", "Daybreak"], "alternates": {"html": "https://wpnews.pro/news/openai-says-new-gpt-5-5-cyber-outperforms-anthropic-s-mythos-on-cybersecurity", "markdown": "https://wpnews.pro/news/openai-says-new-gpt-5-5-cyber-outperforms-anthropic-s-mythos-on-cybersecurity.md", "text": "https://wpnews.pro/news/openai-says-new-gpt-5-5-cyber-outperforms-anthropic-s-mythos-on-cybersecurity.txt", "jsonld": "https://wpnews.pro/news/openai-says-new-gpt-5-5-cyber-outperforms-anthropic-s-mythos-on-cybersecurity.jsonld"}}