… But the company was careful to say in a release that it has stronger cybersecurity safeguards than its predecessor, Opus 4.8, and that it’s “the most aligned Opus model and is the least susceptible to being tricked into misuse.” With the new model’s release, the company also seems to subtly address… …
On Friday evening, the government ordered Anthropic to block access to Fable 5 and Mythos 5 for all foreign nations, both inside and outside the US, due to national security concerns. …
… AISI said the incident should be “interpreted with caution and nuance” but warned the agent’s actions “show signs of novel, potentially deceptive behaviours” that “were to an extent and severity we did not anticipate.” In a blog post, OpenAI acknowledged the breach that happened during AISI’s testi… …
… A broad coalition of companies including Nvidia, Microsoft, and SpaceX argued that the incident showed why defenders need access to the most capable tools available, rather than being forced to rely on proprietary providers whose built-in safeguards can limit their effectiveness in high-stakes secu… …
… Katie Moussouris, the founder and CEO of Luta Security, viewed a report about the Fable 5 vulnerability at Anthropic’s request. …
… OpenAI says it’s especially skilled at coding, cybersecurity, and biology, as well as staying focused during long-horizon agentic AI tasks. …
… How it started It all started in July, when one of OpenAI’s autonomous AI agents went rogue during a cybersecurity test. …
… He’s mitigating this risk by running regular security reviews in Claude, keeping user data local rather than on his servers and building toward stricter retention safeguards. …
… There are security considerations, too. Highly capable open Chinese models, even if trailing the US frontier, could make advanced AI systems available to a much wider range of users, notably in cases where US companies restrict access or impose stronger safeguards. …
… Fable is a Mythos with security guardrails. …
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