A small group of users gained entry to Anthropic’s restricted Claude Mythos Preview AI model on the day the company announced its launch, exploiting a third‑party vendor environment by guessing the model’s URL. Anthropic confirmed it is investigating the incident and said there is no evidence the breach affected its core systems. The episode highlights vulnerabilities in the way frontier AI tools are shielded behind external partners, raising concerns about the security of powerful cybersecurity AI models that can autonomously discover and exploit zero‑day vulnerabilities. Read more →