--- title: Claude Mythos only model to complete full cyber kill... description: Booz Allen's first Cyber Weapon Index evaluated 18 AI models from US and Chinese developers on their ability to autonomously conduct offensive cyber... canonical: https://daily.dev/posts/claude-mythos-only-model-to-complete-full-cyber-kill-chain-experts-say-wztaxk5w0 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Claude Mythos only model to complete full cyber kill chain, experts say | daily.dev og:description: Booz Allen's first Cyber Weapon Index evaluated 18 AI models from US and Chinese developers on their ability to autonomously conduct offensive cyber... og:url: https://daily.dev/posts/claude-mythos-only-model-to-complete-full-cyber-kill-chain-experts-say-wztaxk5w0 og:image: https://api.daily.dev/og/posts/WZTaXk5w0.png og:image:alt: Claude Mythos only model to complete full cyber kill chain, experts say og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Claude Mythos only model to complete full cyber kill chain, experts say **[The Register](https://daily.dev/sources/theregister)** · 6 min read · 2 upvotes · 0 comments ## Summary Booz Allen's first Cyber Weapon Index evaluated 18 AI models from US and Chinese developers on their ability to autonomously conduct offensive cyber operations. Anthropic's Claude Mythos was the only model to complete the full cyber kill chain autonomously, achieving administrator-level control with stolen credentials in every attempt and full domain compromise even without credentials. Grok-4.5, Muse Spark 1.1, and GLM-5.2 reached full domain access but not the entire chain unassisted. The report found that attack harnesses can dramatically amplify a model's offensive capability, with a harness-equipped Claude Sonnet rivaling Mythos, and warns that most other tested models could reach Mythos' weaponization level within six months, calling mainstream AI-driven cyberattacks 'imminent.' ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Which AI model was the only one to complete a full autonomous cyber kill chain in Booz Allen's testing? Anthropic's Claude Mythos was the only model of 18 tested to autonomously execute the entire cyber kill chain without human assistance, scoring 80 on the Cyber Weapon Index. With stolen credentials it gained administrator-level control in every attempt, and even without credentials it achieved full domain compromise by independently discovering how to escalate access. _Security teams evaluating AI-driven attack risk can track model capability shifts like this on daily.dev._ ### How much does the attack harness matter compared to the underlying AI model for offensive cyber capability? The harness matters at least as much as the model itself. Booz Allen found that pairing Claude Sonnet with an optimized attack harness let it rival Claude Mythos' kill-chain performance, showing that orchestration software connecting a model to hacking tools can dramatically amplify focus, adaptability, and multi-stage attack chaining while lowering the skill needed to use it. _Developers building or defending against AI agent tooling can follow harness-related findings on daily.dev._ ### How did Chinese AI models compare to American models in autonomous cyber offense testing? Chinese frontier and open-weight models trailed leading American models but were not far behind in offensive security skills, according to Booz Allen's Cyber Weapon Index. Models like Moonshot AI's Kimi K3 and Z.ai's GLM-5.2 scored 38 and 37 respectively, while DeepSeek-V4-Pro reached lateral movement, suggesting these models could still be deployed in real-world attacks. _Anyone tracking the global AI capability gap can follow comparisons like this on daily.dev._ ## Similar posts on daily.dev - [Claude Mythos Preview completes full cyberattack simulation for the first time](https://daily.dev/posts/claude-mythos-preview-completes-full-cyberattack-simulation-for-the-first-time-dbsyc6gmb) · The New Stack · 0 upvotes · 0 comments --- Tags: [#ai-agents](https://daily.dev/tags/ai-agents), [#vulnerability](https://daily.dev/tags/vulnerability), [#claude](https://daily.dev/tags/claude), [#anthropic](https://daily.dev/tags/anthropic), [#ai-security](https://daily.dev/tags/ai-security) [View this post on daily.dev](https://daily.dev/posts/claude-mythos-only-model-to-complete-full-cyber-kill-chain-experts-say-wztaxk5w0) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Claude Mythos only model to complete full cyber kill chain, experts say","url":"https://daily.dev/posts/claude-mythos-only-model-to-complete-full-cyber-kill-chain-experts-say-wztaxk5w0","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/claude-mythos-only-model-to-complete-full-cyber-kill-chain-experts-say-wztaxk5w0"},"datePublished":"2026-09-02T21:36:17.020Z","dateModified":"2026-09-03T09:16:22.571Z","description":"Booz Allen's first Cyber Weapon Index evaluated 18 AI models from US and Chinese developers on their ability to autonomously conduct offensive cyber...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/236faa0e64e0b03b4c7bc6f905fa91cd?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/236faa0e64e0b03b4c7bc6f905fa91cd?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"The Register","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"The Register","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/66aa2113fdad463992ffcbf0e8963fda","url":"https://daily.dev/sources/theregister"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/claude-mythos-only-model-to-complete-full-cyber-kill-chain-experts-say-wztaxk5w0","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"ai-agents,vulnerability,claude,anthropic,ai-security","timeRequired":"PT6M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"The Register","item":"https://daily.dev/sources/theregister"},{"@type":"ListItem","position":3,"name":"Claude Mythos only model to complete full cyber kill chain, experts say"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/claude-mythos-only-model-to-complete-full-cyber-kill-chain-experts-say-wztaxk5w0#faq","mainEntity":[{"@type":"Question","name":"Which AI model was the only one to complete a full autonomous cyber kill chain in Booz Allen's testing?","acceptedAnswer":{"@type":"Answer","text":"Anthropic's Claude Mythos was the only model of 18 tested to autonomously execute the entire cyber kill chain without human assistance, scoring 80 on the Cyber Weapon Index. With stolen credentials it gained administrator-level control in every attempt, and even without credentials it achieved full domain compromise by independently discovering how to escalate access. Security teams evaluating AI-driven attack risk can track model capability shifts like this on daily.dev."}},{"@type":"Question","name":"How much does the attack harness matter compared to the underlying AI model for offensive cyber capability?","acceptedAnswer":{"@type":"Answer","text":"The harness matters at least as much as the model itself. Booz Allen found that pairing Claude Sonnet with an optimized attack harness let it rival Claude Mythos' kill-chain performance, showing that orchestration software connecting a model to hacking tools can dramatically amplify focus, adaptability, and multi-stage attack chaining while lowering the skill needed to use it. Developers building or defending against AI agent tooling can follow harness-related findings on daily.dev."}},{"@type":"Question","name":"How did Chinese AI models compare to American models in autonomous cyber offense testing?","acceptedAnswer":{"@type":"Answer","text":"Chinese frontier and open-weight models trailed leading American models but were not far behind in offensive security skills, according to Booz Allen's Cyber Weapon Index. Models like Moonshot AI's Kimi K3 and Z.ai's GLM-5.2 scored 38 and 37 respectively, while DeepSeek-V4-Pro reached lateral movement, suggesting these models could still be deployed in real-world attacks. Anyone tracking the global AI capability gap can follow comparisons like this on daily.dev."}}]} ```