Anthropic has pulled its new Claude Fable 5 model from public use after U.S. authorities issued a security‑related order that it must stop all foreign‑national usage of its tool.
In a statement released on its website, the company said the order forced it to deactivate Fable 5 and its sibling Mythos 5 for all customers, citing compliance needs. The company described the model as “too powerful” for release, a claim that some critics call marketing hype.
The U.S. government has not disclosed specific technical worries, but Anthropic claims that officials recognised a method for bypassing or “jailbreaking” the model, allowing security‑bypass techniques that could exploit network defenses. A demonstration highlighted that the model could recognise minor vulnerabilities in other publicly‑available systems without a bypass, yet the risk to users remains a concern.
The situation is complicated by a simultaneous lawsuit in which Anthropic sued the Pentagon over a “supply‑chain risk” designation. A U.S. judge ruled the Pentagon’s directive could not legally be enforced, so government agencies can still use Anthropic’s tools while the case proceeds.
Security experts have noted that the model’s capabilities could exploit cyber protections 73 % of the time, according to a UK AI Security Institute assessment. This performance marks a significant leap in autonomous hacking potential.
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