{"id":13821,"date":"2026-06-24T05:03:25","date_gmt":"2026-06-24T05:03:25","guid":{"rendered":"https:\/\/serisec.com\/index.php\/2026\/06\/24\/anthropics-fable-5-model-jailbroken-within-days-html\/"},"modified":"2026-06-24T05:03:25","modified_gmt":"2026-06-24T05:03:25","slug":"anthropics-fable-5-model-jailbroken-within-days-html","status":"publish","type":"post","link":"https:\/\/serisec.com\/index.php\/2026\/06\/24\/anthropics-fable-5-model-jailbroken-within-days-html\/","title":{"rendered":"Anthropic\u2019s Fable 5 Model Jailbroken Within Days"},"content":{"rendered":"\n<div>Anthropic\u2019s Fable 5 Model Jailbroken Within Days<\/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>Fable 5 is the supposed safe version of Anthropic\u2019s Mythos Preview, with guardrails to ensure that it can\u2019t be used to create cyberattacks.<\/p>\n<p>Well, that restriction was <a href=\"https:\/\/cybersecuritynews.com\/anthropics-claude-fable-5-jailbroken\/\">bypassed<\/a> within days.<\/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\/06\/anthropics-fable-5-model-jailbroken-within-days.html\">Go to bruce schneier<\/a><br \/>\n \t<BR><br \/>\n <BR><\/BR><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Anthropic\u2019s Fable 5 Model Jailbroken Within Days Fable 5 is the supposed safe version of Anthropic\u2019s Mythos Preview, with guardrails to ensure that it can\u2019t be used to create cyberattacks. Well, that restriction was bypassed within days. Bruce Schneier Go to bruce schneier<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[167,57,267,1],"tags":[87],"class_list":["post-13821","post","type-post","status-publish","format-standard","hentry","category-ai","category-bruce-schneier","category-cyberattack","category-uncategorized","tag-bruce-schneier"],"_links":{"self":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/13821"}],"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=13821"}],"version-history":[{"count":0,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/13821\/revisions"}],"wp:attachment":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/media?parent=13821"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/categories?post=13821"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/tags?post=13821"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}