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Anthropic limits access to Mythos, its new cybersecurity AI model

BACKGROUND
1 SIGNALFIRST DETECTED 8 April 2026
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How the story developed
Other feeds and industry voices
22 Apr
Anthropic’s “Mythos” AI Model got accessed by unauthorized users due to 3rd party data breach

<!-- SC_OFF --><div class="md"><p>Anthropic's new cybersecurity-focused Al, Mythos, was reportedly accessed by unauthorized users through a third-party vendor environment (Mercor)

OPINION · HOW · ArtificialInteligenceOPEN STORY
25 May
Anthropic’s restricted Claude Mythos model may be coming to Claude Code

Anthropic appears to be preparing for the public rollout of the Mythos model, which was announced in April as a restricted model that poses major security risks to private and

REPORT · WHAT · BleepingComputerOPEN STORY
22 Apr
Anthropic’s most dangerous AI model just fell into the wrong hands

Anthropic's Mythos AI model, a powerful cybersecurity tool that the company said could be dangerous in the wrong hands, has been accessed by a "small group of unauthorized users,"

REPORT · WHO · The Verge TechOPEN STORY
20 Apr
NSA is said to be using Anthropic's restricted Mythos AI model.

NSA is said to be using Anthropic's restricted Mythos AI model.

OPINION · WHO · TechCrunchOPEN STORY
24 Mar
Claude Code can now take over your computer to complete tasks

But Anthropic urges caution as "research preview" safeguards "aren't absolute."

REPORT · WHAT · Ars TechnicaOPEN STORY
10 Jun
Microsoft restricts Claude Fable for employees over data retention concerns

Anthropic released Claude Fable, its first Mythos-class AI model, yesterday and it's already causing concerns inside Microsoft. Sources tell me that Microsoft is limiting the use

REPORT · WHEN · The Verge TechOPEN STORY
10 Oct
Anthropic Cuts Live Internet Access for Internal AI Tests After Claude Exploits Injection Flaws

Anthropic on Friday said it's cutting off live internet access for all its internal evaluations until further notice following the discovery of new incidents in which its

REPORT · WHO · The Hacker NewsOPEN STORY
29 May
Anthropic confirms Claude Mythos-class models will roll out to the public

Anthropic has confirmed that it plans to bring Mythos-class models to the general public after delaying the rollout due to security risks to public and private software. [...]

REPORT · WHAT · BleepingComputerOPEN STORY
Sources
Ars Technica

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