{"id":12838,"date":"2026-05-14T05:03:30","date_gmt":"2026-05-14T05:03:30","guid":{"rendered":"https:\/\/serisec.com\/index.php\/2026\/05\/14\/openais-gpt-5-5-is-as-good-as-mythos-at-finding-security-vulnerabilities-html\/"},"modified":"2026-05-14T05:03:30","modified_gmt":"2026-05-14T05:03:30","slug":"openais-gpt-5-5-is-as-good-as-mythos-at-finding-security-vulnerabilities-html","status":"publish","type":"post","link":"https:\/\/serisec.com\/index.php\/2026\/05\/14\/openais-gpt-5-5-is-as-good-as-mythos-at-finding-security-vulnerabilities-html\/","title":{"rendered":"OpenAI\u2019s GPT-5.5 is as Good as Mythos at Finding Security Vulnerabilities"},"content":{"rendered":"\n<div>OpenAI\u2019s GPT-5.5 is as Good as Mythos at Finding Security Vulnerabilities<\/div>\n<p> \t<BR><br \/>\n<BR><\/BR><br \/>\n    <!-- no image --><br \/>\n \t<BR><br \/>\n<BR><\/BR><\/p>\n<div>\n<p>The UK\u2019s AI Security Institute evaluated GPT-5.5\u2019s ability to find security vulnerabilities, and <a href=\"https:\/\/www.aisi.gov.uk\/blog\/our-evaluation-of-openais-gpt-5-5-cyber-capabilities\">found<\/a> that it is comparable to Claude Mythos. Note that the OpenAI model is generally available.<\/p>\n<p><a href=\"https:\/\/www.aisi.gov.uk\/blog\/our-evaluation-of-claude-mythos-previews-cyber-capabilities\">Here<\/a> is the Institute\u2019s evaluation of Mythos.<\/p>\n<p>And <a href=\"https:\/\/aisle.com\/blog\/ai-cybersecurity-after-mythos-the-jagged-frontier\">here<\/a> is an analysis of a smaller, cheaper model. It requires more scaffolding from the prompter, but it is also just as good.<\/p>\n<\/div>\n<p> \t<BR><br \/>\n <BR><\/BR><br \/>\n    Bruce Schneier<br \/>\n \t<BR><br \/>\n<BR><\/BR><br \/>\n<a href=\"https:\/\/www.schneier.com\/blog\/archives\/2026\/05\/openais-gpt-5-5-is-as-good-as-mythos-at-finding-security-vulnerabilities.html\">Go to bruce schneier<\/a><br \/>\n \t<BR><br \/>\n <BR><\/BR><\/p>\n","protected":false},"excerpt":{"rendered":"<p>OpenAI\u2019s GPT-5.5 is as Good as Mythos at Finding Security Vulnerabilities The UK\u2019s AI Security Institute evaluated GPT-5.5\u2019s ability to find security vulnerabilities, and found that it is comparable to Claude Mythos. Note that the OpenAI model is generally available. Here is the Institute\u2019s evaluation of Mythos. And here is an analysis of a smaller, [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[167,57,464,1,416],"tags":[87],"class_list":["post-12838","post","type-post","status-publish","format-standard","hentry","category-ai","category-bruce-schneier","category-cybersecurity","category-uncategorized","category-vulnerabilities","tag-bruce-schneier"],"_links":{"self":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/12838"}],"collection":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/comments?post=12838"}],"version-history":[{"count":0,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/12838\/revisions"}],"wp:attachment":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/media?parent=12838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/categories?post=12838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/tags?post=12838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}