{“lastseen”:”2026-06-15T16:16:07″,”description”:”Anthropic has been ordered by the US government to cut off its newest Claude Fable 5 and Mythos 5 models for fear of abuse by adversaries.\\n\\nReuters reports that Anthropic said it will \\”abruptly \u200bdisable\\” its most advanced AI models for all users after the US government ordered it to suspend access to the models for foreign nationals, citing national security \u200cconcerns.\\n\\nOfficials reportedly believe a jailbreak could turn Fable 5 and Mythos 5 into vulnerability-discovery tools for adversaries, so Anthropic says it is disabling them worldwide rather than try to nationality\u2011filter access, since it is virtually impossible to verify every user\u2019s nationality.\\n\\nIn a statement on its website, Anthropic says:\\n\\n\\u003e \u201cThe letter did not provide specific details of its national security concern. Our understanding is that the government believes it has become aware of a method of bypassing, or \u201cjailbreaking\u201d Fable 5. We reviewed a demonstration of this specific technique being used to identify a small number of previously known, minor vulnerabilities. These vulnerabilities all appear relatively simple, and we have found that other publicly-available models are able to discover them as well without requiring a bypass.\u201d\\n\\nMythos 5 is the non-public full version, which is currently used only by government agencies and selected corporate partners to harden their systems. Fable 5 is a Mythos-class model that should supposedly be safe for general use. \\n\\nIt makes sense to me that if Fable 5 is easy to jailbreak, that it should fall under the same restrictions as Mythos 5. However, Anthropic maintains that it has built-in safeguards that mean queries on some topics will instead receive a response from the next-most-capable model, Claude Opus 4.8. \\n\\nThe relationship between the US government and Anthropic had shown signs of easing in parts of the US government after tensions over military use, surveillance, and autonomous weapons. In March, defense Secretary Pete Hegseth designated the San Francisco-based company a \u201csupply-chain risk to national security.\u201d\\n\\nTo understand the nature of the argument, it is necessary to understand that Mythos 5 is described in multiple reports as particularly effective at identifying software vulnerabilities, including long\u2011standing bugs in complex, legacy systems such as those in banking and other critical infrastructure. Many view this as dual\u2011use: great for defense hardening, but catastrophic in the wrong hands.\\n\\nIn recent updates from major software vendors like Microsoft and Google, we’ve seen a growth in numbers of patched vulnerabilities after the vendors began using AI-guided search for new vulnerabilities in their own software. We also know that Mozilla found over 270 Firefox vulnerabilities with the aid of Anthropic\u2019s new Claude Mythos model. \\n\\n## What this means\\n\\nIn the wrong hands these vulnerabilities could definitely do a lot of harm. So, it looks like it will take some time before regular consumers and developers will gain access to Fable 5 and Mythos 5 entirely. However, existing Anthropic models (older Claude variants) remain available.\\n\\nFor home users who were simply chatting with Claude or using it to help with basic scripting, the change will mostly show up as \u201cthis specific version is unavailable\u201d rather than a broader AI blackout.\\n\\nRemoving a high\u2011end vulnerability\u2011finding model from broad circulation increases the effort required for less\u2011resourced cybercriminals to automate discovery of complex bugs in consumer\u2011facing software and services only by so much. There are other models available on the black market that might be just as effective. And for most cybercriminals, turning a vulnerability into a method they can utilize in an exploit is much more relevant.\\n\\n* * *\\n\\n**We don\u2019t just report on threats\u2014we remove them**\\n\\nCybersecurity risks should never spread beyond a headline. Keep threats off your devices by downloading Malwarebytes today.”,”published”:”2026-06-15T14:32:57″,”modified”:”2026-06-15T14:32:57″,”type”:”malwarebytes”,”title”:”Claude Fable 5 and Mythos 5 \\u0026#8220;abruptly disabled\\u0026#8221; after US gov. ban”,”source”:””,”references”:””,”id”:”MALWAREBYTES:DD733E96F8F10DD6044EE94F4172A510″,”bulletinFamily”:”blog”,”cwe”:null,”cvelist”:[],”sourceData”:””,”sourceHref”:””,”cvss”:{“score”:0,”severity”:”NONE”,”vector”:”NONE”,”version”:”NONE”},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:”https:\/\/www.malwarebytes.com\/blog\/ai\/2026\/06\/claude-fable-5-and-mythos-5-abruptly-disabled-after-us-gov-deems-them-too-clever”,”category_name”:”News”,”post_link”:””,”product”:””,”version”:””,”vendor”:””,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"
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