Anthropic's Mythos Breach Tests the Limits of Responsible AI Development

Anthropic got the hard part right. The decision to withhold Mythos from public release — to treat a cyberattack-capable AI model as something requiring controlled, restricted distribution rather than standard deployment — reflects exactly the kind of capability evaluation that responsible scaling frameworks are built around. The failure arrived not in the evaluation but in the execution: rather than any compromise of Anthropic's own systems. That framing is not exculpatory. Anthropic designed the distribution network. The path the unauthorized access…