Researchers say AI just broke every benchmark for autonomous cyber capability | CyberScoop<\/title> <meta name=\"description\" content=\"New research from the UK\u2019s AISI and Palo Alto Networks reveals that OpenAI\u2019s GPT-5.5 and Anthropic\u2019s Claude Mythos have shattered expected trend lines for autonomous cybersecurity, completing complex multi-stage attacks at an unprecedented pace.\"> <link rel=\"canonical\" href=\"https:\/\/cyberscoop.com\/ai-autonomous-cyber-capability-benchmarks-broken-gpt5-claude-mythos\/\"> <meta property=\"og:locale\" content=\"en_US\"> <meta property=\"og:type\" content=\"article\"> <meta property=\"og:title\" content=\"Researchers say AI just broke every benchmark for autonomous cyber capability\"> <meta property=\"og:description\" content=\"New research from the UK\u2019s AISI and Palo Alto Networks reveals that OpenAI\u2019s GPT-5.5 and Anthropic\u2019s Claude Mythos have shattered expected trend lines for autonomous cybersecurity, completing complex multi-stage attacks at an unprecedented pace.\"> <meta property=\"og:url\" content=\"https:\/\/cyberscoop.com\/ai-autonomous-cyber-capability-benchmarks-broken-gpt5-claude-mythos\/\"> <meta property=\"og:site_name\" content=\"CyberScoop\"> <meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/cyberscoop\/\"> <meta property=\"article:published_time\" content=\"2026-05-13T22:29:19+00:00\"> <meta property=\"article:modified_time\" content=\"2026-05-13T22:29:22+00:00\"> <meta property=\"og:image\" content=\"https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg\"> <meta property=\"og:image:width\" content=\"6000\"> <meta property=\"og:image:height\" content=\"4000\"> <meta property=\"og:image:type\" content=\"image\/jpeg\"> <meta name=\"author\" content=\"Greg Otto\"> <meta name=\"twitter:card\" content=\"summary_large_image\"> <meta name=\"twitter:creator\" 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\/><\/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=\"26.366737739872\">\n<div class=\"single-article__header-content\" readability=\"36.132196162047\">\n<p> Two independent studies found that Anthropic’s Claude Mythos Preview and OpenAI’s GPT-5.5 have outpaced every trend line researchers were tracking. No one is sure if this is a one-time leap or the new normal. <\/p>\n<p>  <br \/>\n<audio id=\"audio-player\" src=\"https:\/\/wp-tts-cdn.api.scpnewsgrp.com\/cyberscoop\/89006\/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\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability.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\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg 6000w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=300,200 300w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=768,512 768w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=1024,683 1024w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=1536,1024 1536w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=2048,1365 2048w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=600,400 600w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=252,168 252w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=506,337 506w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=1013,675 1013w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-2.jpg?resize=1265,843 1265w\" sizes=\"(max-width: 1013px) 100vw, 1013px\"> <\/figure>\n<\/p><\/div>\n<\/header>\n<div class=\"single-article__content\">\n<div class=\"single-article__content-inner has-drop-cap\"> <html readability=\"40.889308426073\"><body readability=\"83.440708768741\"><\/p>\n<p>Two of the most advanced artificial intelligence models \u2014 Anthropic\u2019s Claude Mythos Preview and OpenAI\u2019s GPT-5.5 \u2014 have significantly surpassed the already-accelerating pace at which <a href=\"https:\/\/cyberscoop.com\/tag\/artificial-intelligence-ai\/\" target=\"_blank\" rel=\"noreferrer noopener\">AI<\/a> systems are completing autonomous cybersecurity tasks, according to separate findings published Wednesday by the United Kingdom\u2019s AI Security Institute (AISI) and Palo Alto Networks.<\/p>\n<p>The AISI, which conducts pre-deployment evaluations of frontier AI models on behalf of the British government, said both <a href=\"https:\/\/cyberscoop.com\/tag\/anthropic\/\">Claude Mythos Preview<\/a> and GPT-5.5 have substantially exceeded the doubling trend the institute had been tracking since late 2024. Whether the results represent an isolated capability jump or the start of a new, faster trajectory remains unclear.<\/p>\n<p>The AISI estimated earlier this year that frontier models\u2019 80% reliability cyber time horizon \u2014 a measure of how long a task takes a human expert, used as a proxy for AI autonomy \u2014 had been doubling approximately every five months. That was itself roughly half the eight-month doubling time the institute estimated in November 2025. Now Mythos Preview and GPT-5.5 have since outperformed any trend lines the institute has measured.<\/p>\n<p>\u201cFrontier AI\u2019s autonomous cyber and software capability is advancing quickly: the length of cyber tasks that frontier models can complete autonomously has doubled on the order of months, not years,\u201d <a href=\"https:\/\/www.aisi.gov.uk\/blog\/how-fast-is-autonomous-ai-cyber-capability-advancing\">the AISI wrote<\/a>.<\/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>The clearest evidence of the capability jump came from the AISI\u2019s cyber ranges, its structured simulations of multi-stage attacks against small, undefended enterprise networks. A newer checkpoint of Claude Mythos Preview became the first model to complete both of the institute\u2019s ranges. It solved \u201cThe Last Ones,\u201d a 32-step simulated corporate network attack, in 6 of 10 attempts, and completed \u201cCooling Tower\u201d \u2014 previously unsolved by any model \u2014 in 3 of 10 attempts. GPT-5.5 solved \u201cThe Last Ones\u201d in 3 of 10 attempts.<\/p>\n<p>Palo Alto Networks <a href=\"https:\/\/www.paloaltonetworks.com\/blog\/2026\/05\/defenders-guide-frontier-ai-impact-cybersecurity-may-2026-update\/\">reached similar conclusions<\/a> through its own testing. The company said it began testing Claude Mythos in April as a launch partner for Anthropic\u2019s <a href=\"https:\/\/cyberscoop.com\/project-glasswing-anthropic-ai-open-source-software-vulnerabilities\/\">Project Glasswing<\/a>, and has since tested Claude Opus 4.7 and OpenAI\u2019s GPT-5.5-Cyber as part of <a href=\"https:\/\/cyberscoop.com\/tag\/openai\/\">OpenAI<\/a>\u2018s Trusted Access for Cyber program.<\/p>\n<p>\u201cThe latest models are extraordinarily capable at finding vulnerabilities and changing them into critical exploit paths in near-real-time,\u201d Palo Alto Networks wrote.<\/p>\n<p><a href=\"https:\/\/security.paloaltonetworks.com\/?sort=-date&limit=100\">The company released security advisories<\/a> covering 26 CVEs representing 75 issues \u2014 compared to a typical monthly volume of fewer than five CVEs \u2014 that were identified through AI model scanning across more than 130 products. All important vulnerabilities in its SaaS products had been patched, with patches available for all customer-operated products.<\/p>\n<p>The AISI was careful to note the limits of its data. The estimates are based on a relatively small number of models, and the hardest tasks in the test suite have the least amount of human comparison data. Even so, the institute said the overall trend holds up: dropping any single model from the analysis barely moves the needle, shifting the estimated doubling time by less than a month in either direction. Separate research from <a href=\"https:\/\/metr.org\/\">METR<\/a>, a nonprofit that tracks how quickly AI handles software tasks, arrived at a nearly identical figure \u2014 a doubling time of approximately four months since late 2024.<\/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>\u201cNo single benchmark result should be read as a precise measure of AI capability,\u201d the AISI wrote. \u201cRegardless, the direction of change and rapid growth have been consistent across the models, methodological choices and independent data we examined.\u201d<\/p>\n<p>Palo Alto Networks outlined four immediate priorities for enterprises as these models continue to grow in usage: First, find and fix vulnerabilities in code and applications before attackers do. Second, shrink the attack surface and use AI to spot security misconfigurations. Third, deploy detection and response tools across all systems, using machine learning to catch threats in real time. Fourth, build security operations fast enough to respond in minutes, because AI-powered attacks may soon unfold that quickly.<\/p>\n<p>The AISI said it is developing more demanding evaluations, including new cyber ranges and the addition of active cyber defenses, to better reflect real-world conditions as model capabilities continue to advance.<\/p>\n<p><\/body> <\/p>\n<footer class=\"single-article__footer\" readability=\"3.6701112877583\">\n<div class=\"author-card\" readability=\"14\">\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\/05\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability-1.jpg?w=640&ssl=1\" alt=\"Greg Otto\"> <\/figure>\n<\/p><\/div>\n<p><h4 class=\"author-card__name\">Written by Greg Otto<\/h4>\n<p> Greg Otto is Editor-in-Chief of CyberScoop, overseeing all editorial content for the website. Greg has led cybersecurity coverage that has won various awards, including accolades from the Society of Professional Journalists and the American Society of Business Publication Editors. Prior to joining Scoop News Group, Greg worked for the Washington Business Journal, U.S. News & World Report and WTOP Radio. 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{"id":8641,"date":"2026-05-13T17:29:19","date_gmt":"2026-05-13T22:29:19","guid":{"rendered":"https:\/\/cyberscoop.com\/?p=89006"},"modified":"2026-05-13T17:29:19","modified_gmt":"2026-05-13T22:29:19","slug":"researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability","status":"publish","type":"post","link":"https:\/\/ddi.mohflo.net\/index.php\/2026\/05\/13\/researchers-say-ai-just-broke-every-benchmark-for-autonomous-cyber-capability\/","title":{"rendered":"Researchers say AI just broke every benchmark for autonomous cyber capability"},"content":{"rendered":"