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Anthropic Mythos AI model: Unauthorised users gain access via third-party vendor environment

The Australian Financial Review

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Details

Date Published
22 Apr 2026
Priority Score
5
Australian
Yes
Created
22 Apr 2026, 10:00 am

Authors (1)

Description

The tech start-up has limited the release of the new tool because of concerns about its potential for misuse.

Summary

This breach highlights a critical vulnerability in the supply chain security of frontier AI labs, as unauthorized users bypassed safeguards to access Mythos, a model Anthropic had restricted due to high misuse potential. The incident underscores the difficulty of maintaining model weights and access controls when collaborating with third-party vendors, posing a significant risk for the proliferation of powerful dual-use capabilities. Such leaks are central to the discourse on catastrophic risk, as they demonstrate how frontier safety protocols can be circumvented through infrastructure weaknesses. The event provides a relevant case study for global AI governance frameworks focused on hardening the security of infrastructure used by developers of advanced AI systems.

Body

WorldNorth AmericaAIPrint articleZaheer KachwalaApr 22, 2026 – 2.33pmA small group of unauthorised users has accessed Anthropic’s new Mythos AI model, media reported on Wednesday, citing documentation and a person familiar with the matter.Anthropic is investigating the reports that a handful of users gained access to the powerful new artificial intelligence tool through a system set up for third-party companies doing work for the company.Loading...Bloomberg and ReutersSaveLog in or Subscribe to save articleShareCopy linkCopiedEmailLinkedInTwitterFacebookCopy linkCopiedShare via...Gift this articleSubscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? LoginFollow the topics, people and companies that matter to you.Find out moreRead MoreAIAnthropicRBAMalcolm TurnbullAppleMicrosoftAmazonFetching latest articles