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New Claude Mythos becomes the first AI model to clear all cyberattack simulations from Britain's AI safety agency
The UK's AI Security Institute has revised its estimate of how fast AI cyber capabilities are doubling—twice. First from eight months down to 4.7, and now Anthropic's Claude Mythos Preview and OpenAI's GPT-5.5 have blown past even that accelerated timeline. Mythos is the first model to clear all of AISI's attack simulations. Anthropic's head of red teaming, Logan Graham, warns, "Within a year, Mythos will probably look quite dumb."
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schneier.com
OpenAI's GPT-5.5 is as Good as Mythos at Finding Security Vulnerabilities - Schneier on Security
The UK’s AI Security Institute evaluated GPT-5.5’s ability to find security vulnerabilities, and found that it is comparable to Claude Mythos. Note that the OpenAI model is…
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theverge.com
AI cybersecurity updates for MDASH, Mythos, and GPT-5.5.
On Wednesday, the AISI, which evaluates AI models for the British government, said both Anthropic’s Claude Mythos Preview and OpenAI’s GPT-5.5 showed progress well above previous…
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How Dangerous Is Anthropic's Mythos AI? - Schneier on Security
Last month, Anthropic made a remarkable announcement about its new model, Claude Mythos Preview: it was so good at finding security vulnerabilities in software that the company…
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the-decoder.com
New Claude Mythos becomes the first AI model to clear all cyberattack simulations from Britain's AI safety agency
The UK's AI Security Institute has revised its estimate of how fast AI cyber capabilities are doubling—twice. First from eight months down to 4.7, and now Anthropic's Claude…
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zdnet.com
Anthropic's Mythos is evolving faster than expected, reports AI safety agency
Only a month after its initial release, Anthropic's storied Mythos model is breaking new testing boundaries.