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With a formal hearing looming and a federal divide over the model's "supply chain risk" status, Congress is racing to define the government's role in the frontier AI era.\"> <link rel=\"canonical\" href=\"https:\/\/cyberscoop.com\/house-homeland-security-briefing-anthropic-mythos-cyber-risks\/\"> <meta property=\"og:locale\" content=\"en_US\"> <meta property=\"og:type\" content=\"article\"> <meta property=\"og:title\" content=\"Closed briefing sets stage for House hearing on Anthropic\u2019s Mythos and cyber risks\"> <meta property=\"og:description\" content=\"House lawmakers held a closed-door briefing on Anthropic\u2019s Mythos AI, weighing the model's autonomous hacking capabilities against national security. With a formal hearing looming and a federal divide over the model's "supply chain risk" status, Congress is racing to define the government's role in the frontier AI era.\"> <meta property=\"og:url\" content=\"https:\/\/cyberscoop.com\/house-homeland-security-briefing-anthropic-mythos-cyber-risks\/\"> <meta property=\"og:site_name\" content=\"CyberScoop\"> <meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/cyberscoop\/\"> <meta property=\"article:published_time\" content=\"2026-05-13T22:10:00+00:00\"> <meta property=\"article:modified_time\" content=\"2026-05-13T23:13:14+00:00\"> <meta property=\"og:image\" content=\"https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg\"> <meta property=\"og:image:width\" content=\"1920\"> <meta property=\"og:image:height\" content=\"1250\"> <meta property=\"og:image:type\" content=\"image\/jpeg\"> <meta name=\"author\" content=\"Tim 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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=\"26.33606557377\">\n<div class=\"single-article__header-content\" readability=\"35.8\">\n<p> The committee held a closed briefing Wednesday with company reps, and more oversight is in the works. <\/p>\n<p>  <br \/>\n<audio id=\"audio-player\" src=\"https:\/\/wp-tts-cdn.api.scpnewsgrp.com\/cyberscoop\/89003\/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=\"417\" src=\"https:\/\/i0.wp.com\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks.jpg?resize=640%2C417&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\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg 1920w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg?resize=300,195 300w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg?resize=768,500 768w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg?resize=1024,667 1024w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg?resize=1536,1000 1536w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg?resize=600,391 600w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg?resize=258,168 258w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg?resize=518,337 518w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg?resize=1037,675 1037w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/05\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-2.jpg?resize=1295,843 1295w\" sizes=\"(max-width: 1037px) 100vw, 1037px\"><figcaption> Steam from a vent obscures the U.S. Capitol in Washington, D.C. Photographer: Julia Nikhinson\/Bloomberg; 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=\"34.41475295755\"><body readability=\"73.961517761033\"><\/p>\n<p>The House Homeland Security Committee is digging into Anthropic\u2019s AI model Mythos in a series of briefings and hearings, as questions proliferate on whether and how the federal government will make use of the technology touted for its ability to autonomously uncover cyber vulnerabilities.<\/p>\n<p>Wednesday brought a closed-door briefing for the House Homeland Security Committee from Anthropic. The chairman of the panel\u2019s cybersecurity subcommittee said he is planning to hold a hearing on the topic. And committee Democrats are requesting a classified briefing with Anthropic.<\/p>\n<p>A committee aide who attended the briefing said it included a live demonstration of Mythos, \u201callowing members to see firsthand how advanced AI can identify and reason through software vulnerabilities. What we saw reinforced the urgency of ensuring that federal agencies, including our civilian cyber defenders, can responsibly access and deploy the most advanced U.S. models to find and patch vulnerabilities before foreign adversaries or criminal actors exploit them.\u201d<\/p>\n<p>A number of key lawmakers, including top committee Democrat Bennie Thompson of Mississippi and GOP cyber subcommittee chair Andy Ogles of Tennessee, told CyberScoop they weren\u2019t able to attend Wednesday\u2019s briefing. A second source who attended said it was a \u201cproductive\u201d meeting.<\/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>\u201cMembers on both sides were focused on preserving U.S. advantage in AI, which basically came down to preserving our edge on compute power,\u201d the source said. \u201cThey were also asking questions about whether the federal government was using Mythos, including about where CISA is and the impact of the supply chain risk designation.\u201d<\/p>\n<p>The Hill reported that Wednesday\u2019s briefing <a href=\"https:\/\/thehill.com\/policy\/technology\/5875253-house-briefing-anthropic-mythos\/\">was led<\/a> on the Anthropic side by Logan Graham, from the company\u2019s frontier red team, and Josh Tilstra, from the firm\u2019s national security programs and policy team. It follows <a href=\"https:\/\/www.axios.com\/2026\/04\/28\/openai-anthropic-congress-cyber-briefings\">another recent closed briefing<\/a> with Anthropic and OpenAI for the House Homeland Security Committee.<\/p>\n<p>Ogles told CyberScoop he plans to hold a hearing of his subcommittee related to Mythos, but wasn\u2019t able to attend Wednesday\u2019s briefing due to scheduling conflicts. The top Democrat on Ogle\u2019s subcommittee, Delia Ramirez of Illinois, also was unable to join due to prior commitments, but she was set to receive a rundown from staff about Wednesday\u2019s briefing, her office said.<\/p>\n<p>There\u2019s a divide on which federal agencies are using Mythos thus far. For example: <a href=\"https:\/\/www.axios.com\/2026\/04\/21\/cisa-anthropic-mythos-ai-security\">CISA reportedly isn\u2019t<\/a>, but <a href=\"https:\/\/www.axios.com\/2026\/04\/19\/nsa-anthropic-mythos-pentagon\">the National Security Agency is<\/a>. <\/p>\n<p>The federal divide on its use follows a Department of Defense blacklist that labeled the company a \u201csupply chain risk\u201d after <a href=\"https:\/\/defensescoop.com\/2026\/02\/19\/pentagon-anthropic-dispute-military-ai-hegseth-emil-michael\/\">Anthropic resisted pressure from the Pentagon<\/a> to use its Claude AI model in ways the company opposed. The department says it <a href=\"https:\/\/www.reuters.com\/technology\/pentagon-deploys-anthropics-mythos-patch-cyber-gaps-while-planning-ditch-firm-2026-05-12\/\">has been using Mythos<\/a> to identify cyber vulnerabilities despite the blacklist.<\/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><a href=\"https:\/\/www.washingtonpost.com\/politics\/2026\/05\/11\/trump-ai-regulation-commerce-intelligence\/\">A turf battle is brewing<\/a> within the Trump administration over testing of AI models, The Washington Post reported this week. Connecticut Rep. Jim Himes, the top Democrat on the House Intelligence Committee, said this week that <a href=\"https:\/\/www.nextgov.com\/artificial-intelligence\/2026\/05\/it-would-be-insane-spy-agencies-not-have-ai-model-early-access-lawmaker-says\/413483\/?oref=ng-home-top-story\">it would be \u2018insane\u201d<\/a> for U.S. spy agencies not to have early access to advanced AI models.<\/p>\n<p>The Mythos briefing came one day after OpenAI announced <a href=\"https:\/\/cyberscoop.com\/openai-daybreak-gpt-5-5-anthropic-mythos-cybersecurity\/\">its own cybersecurity initiative<\/a>.<\/p>\n<p>The committee aide said that \u201cas the PRC aggressively works to close the AI innovation gap with the United States, the committee remains focused on ensuring that America\u2019s AI leadership translates into a durable national security advantage, not a temporary lead that adversaries can copy, steal, or rapidly commoditize.\u201d<\/p>\n<p><em>Updated 5\/13\/26: to include comment from a committee aide who attended the briefing.<\/em><\/p>\n<p><\/body> <\/p>\n<footer class=\"single-article__footer\">\n<div class=\"author-card\" readability=\"7.7216117216117\">\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\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks-1.jpg?w=640&ssl=1\" alt=\"Tim Starks\"> <\/figure>\n<\/p><\/div>\n<div class=\"author-card__details\" readability=\"10.901098901099\">\n<h4 class=\"author-card__name\">Written by Tim Starks<\/h4>\n<p> Tim Starks is senior reporter at CyberScoop. His previous stops include working at The Washington Post, POLITICO and Congressional Quarterly. An Evansville, Ind. native, he’s covered cybersecurity since 2003. Email Tim here: <a href=\"mailto:tim.starks@cyberscoop.com\">tim.starks@cyberscoop.com<\/a>. <\/div>\n<\/p><\/div>\n<div class=\"single-article__tags-container\">\n<h4 class=\"single-article__tags-title\">In This Story<\/h4>\n<\/p><\/div>\n<\/footer>\n<p> <\/html><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"single-article__ads js-single-article-sidebar\">\n<div class=\"ad ad--sidebar js-single-article-sidebar-5 ad--rightrail_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<div class=\"ad ad--sidebar js-single-article-sidebar-4 ad--rightrail_2 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<div class=\"ad ad--sidebar js-single-article-sidebar-3 ad--rightrail_3 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div><\/div>\n<\/article>\n<div class=\"popular-stories popular-stories--single-post\">\n<div 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Mythos<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[235,4940,2381,384,2030,4995,452,6531,1351,117,1093,1827,414,6410,304,564,439],"tags":[236,4943,2384,388,2032,4996,454,6532,1353,119,1095,1833,416,6412,308,565,443],"class_list":["post-8642","post","type-post","status-publish","format-standard","hentry","category-ai","category-andy-ogles","category-anthropic","category-artificial-intelligence-ai","category-bennie-thompson","category-claude","category-cybersecurity-and-infrastructure-security-agency-cisa","category-delia-ramirez","category-department-of-defense-dod","category-government","category-house-homeland-security-committee","category-house-intelligence-committee","category-intelligence-community-ic","category-mythos","category-national-security-agency-nsa","category-openai","category-policy","tag-ai","tag-andy-ogles","tag-anthropic","tag-artificial-intelligence-ai","tag-bennie-thompson","tag-claude","tag-cybersecurity-and-infrastructure-security-agency-cisa","tag-delia-ramirez","tag-department-of-defense-dod","tag-government","tag-house-homeland-security-committee","tag-house-intelligence-committee","tag-intelligence-community-ic","tag-mythos","tag-national-security-agency-nsa","tag-openai","tag-policy"],"featured_image_urls":{"full":"","thumbnail":"","medium":"","medium_large":"","large":"","1536x1536":"","2048x2048":"","chromenews-featured":"","chromenews-large":"","chromenews-medium":""},"author_info":{"display_name":"Cyber Scoop","author_link":"https:\/\/ddi.mohflo.net\/index.php\/author\/cyberscoop\/"},"category_info":"<a href=\"https:\/\/ddi.mohflo.net\/index.php\/category\/ai\/\" rel=\"category tag\">AI<\/a> <a href=\"https:\/\/ddi.mohflo.net\/index.php\/category\/andy-ogles\/\" rel=\"category tag\">Andy Ogles<\/a> <a href=\"https:\/\/ddi.mohflo.net\/index.php\/category\/anthropic\/\" rel=\"category tag\">Anthropic<\/a> <a href=\"https:\/\/ddi.mohflo.net\/index.php\/category\/artificial-intelligence-ai\/\" rel=\"category tag\">artificial intelligence (AI)<\/a> <a href=\"https:\/\/ddi.mohflo.net\/index.php\/category\/bennie-thompson\/\" rel=\"category tag\">Bennie Thompson<\/a> <a href=\"https:\/\/ddi.mohflo.net\/index.php\/category\/claude\/\" rel=\"category tag\">Claude<\/a> <a href=\"https:\/\/ddi.mohflo.net\/index.php\/category\/cybersecurity-and-infrastructure-security-agency-cisa\/\" rel=\"category tag\">Cybersecurity and Infrastructure Security Agency (CISA)<\/a> <a 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{"id":8642,"date":"2026-05-13T17:10:00","date_gmt":"2026-05-13T22:10:00","guid":{"rendered":"https:\/\/cyberscoop.com\/?p=89003"},"modified":"2026-05-13T17:10:00","modified_gmt":"2026-05-13T22:10:00","slug":"closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks","status":"publish","type":"post","link":"https:\/\/ddi.mohflo.net\/index.php\/2026\/05\/13\/closed-briefing-sets-stage-for-house-hearing-on-anthropics-mythos-and-cyber-risks\/","title":{"rendered":"Closed briefing sets stage for House hearing on Anthropic\u2019s Mythos and cyber risks"},"content":{"rendered":"