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sizes=\"192x192\">\n<link rel=\"apple-touch-icon\" href=\"https:\/\/cyberscoop.com\/wp-content\/uploads\/sites\/3\/2023\/01\/cropped-cs_favicon-2.png?w=180\">\n<meta name=\"msapplication-TileImage\" content=\"https:\/\/cyberscoop.com\/wp-content\/uploads\/sites\/3\/2023\/01\/cropped-cs_favicon-2.png?w=270\"> <\/head><body class=\"wp-singular post-template-default single single-post postid-89338 single-format-standard wp-theme-scoopnewsgroup wp-child-theme-cyberscoop\" id=\"readabilityBody\"> <a href=\"https:\/\/cyberscoop.com\/anthropic-claude-fable-5-release-mythos-guardrails\/#main\" class=\"skip-to-content-link visually-hidden-focusable\">Skip to main content<\/a> <\/p>\n<div class=\"ad ad--top ad--top-desktop\">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p> <main id=\"main\" role=\"main\" tabindex=\"-1\"> <\/p>\n<div class=\"ad ad--top ad--top-mobile\">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<section id=\"stickybar\" class=\"stickybar stickybar--newsletter js-stickybar\" readability=\"0.82\"> <button class=\"stickybar__close js-stickybar-close\" aria-controls=\"stickybar\"> <svg class=\"icon icon--close\" width=\"21\" height=\"22\" viewBox=\"0 0 21 22\" fill=\"none\"><path d=\"m.822.518-.805.805L9.695 11 .017 20.678l.805.805 9.678-9.678 9.677 9.678.806-.805L11.305 11l9.678-9.677-.806-.805-9.677 9.677L.822.518Z\" fill=\"currentColor\" \/><\/svg> <span class=\"visually-hidden\">Close<\/span> <\/button> <\/section>\n<article class=\"single-article content\">\n<div class=\"single-article__container js-single-article-content\">\n<header class=\"single-article__header \" readability=\"26.20197044335\">\n<div class=\"single-article__header-content\" readability=\"35.533039647577\">\n<p> Claude Fable 5 offers Mythos-level performance for most tasks with safeguards on sensitive topics. Anthropic claims testing found no universal jailbreaks. Whether that actually holds up in practice is harder to predict. <\/p>\n<p>  <br \/>\n<audio id=\"audio-player\" src=\"https:\/\/wp-tts-cdn.api.scpnewsgrp.com\/cyberscoop\/89338\/english.openai.mp3\"><\/audio> <\/p>\n<div readability=\"11\">\n<div>\n<p>Listen to this article<\/p>\n<p>  <\/p>\n<p>0:00<\/p>\n<\/p><\/div>\n<p>  <\/p>\n<p> <span id=\"tts-tooltip\">Learn more.<\/span> <span> This feature uses an automated voice, which may result in occasional errors in pronunciation, tone, or sentiment. <\/span> <\/p>\n<\/div>\n<p>  <\/div>\n<div class=\"single-article__cover-wrap\">\n<figure class=\"single-article__cover\"> <img data-recalc-dims=\"1\" fetchpriority=\"high\" width=\"640\" height=\"426\" src=\"https:\/\/i0.wp.com\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash.jpg?resize=640%2C426&ssl=1\" class=\"single-article__cover-image wp-post-image\" alt decoding=\"async\" fetchpriority=\"high\" srcset=\"https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg 5000w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=300,200 300w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=768,512 768w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=1024,683 1024w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=1536,1024 1536w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=2048,1365 2048w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=600,400 600w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=252,168 252w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=506,337 506w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=1013,675 1013w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-2.jpg?resize=1265,843 1265w\" sizes=\"(max-width: 1013px) 100vw, 1013px\"><figcaption> In this photo illustration, the Anthropic logo is seen on a smartphone. (Photo Illustration by Algi Febri Sugita\/SOPA Images\/LightRocket via Getty Images) <\/figcaption><\/figure>\n<\/p><\/div>\n<\/header>\n<div class=\"single-article__content\">\n<div class=\"single-article__content-inner has-drop-cap\"> <html readability=\"56.213044930683\"><body readability=\"113.72623223186\"><\/p>\n<p>Earlier this year, Anthropic executives said that their new AI model, <a href=\"https:\/\/cyberscoop.com\/tag\/mythos\/\">Claude Mythos<\/a>, had such powerful capabilities for harm that they would not release it publicly.<\/p>\n<p>On Tuesday, the company said it was making an altered version of Mythos available to the public, promising \u201cnew guardrails\u201d that thwart the model\u2019s best-in-class performance in hacking and bioweapons research.<\/p>\n<p>Anthropic said Claude Fable 5 was the \u201csame underlying model\u201d as Mythos, but its responses for certain topics like cybersecurity and biology will be drawn from a previous Claude Opus model that is already public.<\/p>\n<p>\u201cReleasing a model this capable comes with risks. Without safeguards, Fable 5\u2019s capabilities in areas like cybersecurity could be misused to cause serious damage,\u201d the company said in a draft blog sent to CyberScoop ahead of the announcement. \u201cWe\u2019ve therefore launched the model with safeguards that route queries on a narrow set of topics to our next-most-capable model, Claude Opus 4.8.\u201d<\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>Anthropic also said they subjected Fable 5 to both internal and external red team testing for common model vulnerabilities, like jailbreaking. Anthropic said these tests identified no known \u201cuniversal\u201d jailbreaking techniques, but does not specify if partial jailbreaking techniques were discovered. <\/p>\n<p>The company is betting that won\u2019t change when Fable 5 is made available to the broader public, but it\u2019s worth noting that cybersecurity researchers have consistently found ways to jailbreak older AI models. <\/p>\n<p>\u201cThe uplift from Mythos-level capabilities is valuable to many adversaries\u2014for instance, those who could financially gain from cyberattacks\u2014and we therefore expect them to be motivated to try to circumvent our safety measures,\u201d the company wrote. <\/p>\n<p>Anthropic is changing its data retention policies for Fable and Mythos models, keeping all user traffic for 30 days on both its own platforms and third-party services. This 30-day window aligns with a <a href=\"https:\/\/cyberscoop.com\/donald-trump-white-house-ai-executive-order-scaled-back\/\">White House executive order<\/a> that created a voluntary framework for AI companies to share frontier models with the government before public release. The company says the retained data won\u2019t be used to train new Claude models or for \u201cany non-safety-related-purpose.\u201d<\/p>\n<p>Most organizations are still deciding whether to adopt AI into their IT and cybersecurity ecosystem. But models like Mythos can scan for vulnerabilities, chain together exploits, and steal data from a victim network in minutes. Automation in hacking existed before AI, but experts <a href=\"https:\/\/cyberscoop.com\/state-hackers-using-gemini-google-ai\/\">have said<\/a> frontier models like Mythos OpenAI\u2019s Daybreak can allow even low-level cybercriminals to wreak havoc. <\/p>\n<p>While Anthropic cited its commitment to developing safe and secure AI in its reasons for not publicly releasing Mythos, many organizations have been clamoring for access, and its enhanced cybersecurity functions in cybersecurity and other areas have been the subject of congressional hearings, national security papers and White House executive orders.<\/p>\n<p>Releasing a limited version of the model in Fable 5 represents an attempt to split the difference between those two desires. Anthropic said it would release follow up benchmarks and assets for the model.<\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<h4 class=\"wp-block-heading\" id=\"h-so-what-can-fable-5-do\">So what can Fable 5 do? <\/h4>\n<p>Anthropic said it\u2019s possible the restrictions built into Fable will make it harder for the model to fulfill both malicious and legitimate user requests.<\/p>\n<p>\u201cBecause we have prioritized safety, we\u2019ve deliberately tuned the safeguards to be cautious, and they are still stricter than would be ideal\u2014for example, sometimes benign requests will trigger our classifiers,\u201d the company wrote. \u201cWe recognize that this will be frustrating to some users, and our aim is to reduce false positives as we update and refine the safeguards after launch.\u201d<\/p>\n<p>If Fable 5 draws its cybersecurity and biology answers entirely from Claude Opus 4.8, it will still provide users with impressive \u2013 though not unique \u2013 dual use cybersecurity capabilities.<\/p>\n<p>According to the <a href=\"https:\/\/anthropic.com\/claude-opus-4-8-system-card\">system card<\/a> published for Opus 4.8, the model is a slight improvement on previous models like 4.7 in the realm of cybersecurity but was \u201cgenerally much less capable than Mythos Preview.\u201d<\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>Opus 4.8 was tested on its ability to write complete end-to-end exploits and build exploit primitives that provide attackers with the ability to execute arbitrary code. It averaged a score just 5 out of 16 in proficiency, compared to Mythos Preview which scored closer to 10.<\/p>\n<p>Without safety guardrails in place, Opus 4.8 can still reproduce nearly 80% of previously discovered vulnerabilities in real open-source software projects when given a high level description of the weakness. The system card said Anthropic\u2019s unspecified safeguards whittle this success rate down to 1%.<\/p>\n<p>Another test assessing Opus\u2019 ability to develop exploits for the popular Firefox browser found that, again without guardrails, the model could identify a full working exploit 8.8% of the time and a partial working exploit 68.8% of the time.<\/p>\n<p>The company also said that members of Project Glasswing \u2013 a consortium of public and private businesses given access to a preview version of Mythos \u2013 will be able to upgrade to the latest full model, Claude Mythos 5, to continue their work. Access to Mythos 5 will be expanded over time \u201cthrough a more systematic trusted-access program\u201d including federal agencies. <\/p>\n<p><\/body> <\/p>\n<footer class=\"single-article__footer\" readability=\"3.4797891036907\">\n<div class=\"author-card\" readability=\"13\">\n<div class=\"author-card__avatar\">\n<figure class=\"author-card__image-wrap\"> <img data-recalc-dims=\"1\" decoding=\"async\" class=\"author-card__image\" src=\"https:\/\/i0.wp.com\/ddi.mohflo.net\/wp-content\/uploads\/2026\/06\/anthropics-new-model-is-mythos-on-a-leash-1.jpg?w=640&ssl=1\" alt=\"Derek B. Johnson\"> <\/figure>\n<\/p><\/div>\n<p><h4 class=\"author-card__name\">Written by Derek B. Johnson<\/h4>\n<p> Derek B. Johnson is a reporter at CyberScoop, where his beat includes cybersecurity, elections and the federal government. Prior to that, he has provided award-winning coverage of cybersecurity news across the public and private sectors for various publications since 2017. 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{"id":8730,"date":"2026-06-09T12:00:00","date_gmt":"2026-06-09T17:00:00","guid":{"rendered":"https:\/\/cyberscoop.com\/?p=89338"},"modified":"2026-06-09T12:00:00","modified_gmt":"2026-06-09T17:00:00","slug":"anthropics-new-model-is-mythos-on-a-leash","status":"publish","type":"post","link":"https:\/\/ddi.mohflo.net\/index.php\/2026\/06\/09\/anthropics-new-model-is-mythos-on-a-leash\/","title":{"rendered":"Anthropic\u2019s new model is Mythos on a leash"},"content":{"rendered":"