The AI company Anthropic released a 244 page “system card” PDF this week describing its newest model, Claude Mythos. The model is “our most capable frontier model to date,” the company says, and supposedly is so good that Anthropic has decided “not to make it generally available.” The company claims that Mythos is too good at finding unknown cybersecurity bugs, and so the model is only being released to select companies like Microsoft and Apple for now. Whatever the truth of this claim, the...

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