Here's what next as Anthropic's most powerful AI model leaked via unsecured data cache

A draft blog post left in an unsecured data cache revealed a new model tier called Capybara that Anthropic says is more capable than anything it has built, with the company flagging "unprecedented" cybersecurity risks. What to know : A leaked draft blog post revealed that Anthropic is testing a new AI model, Claude Mythos, which it internally describes as by far its most powerful system to date. The model, part of a new "Capybara" tier, reportedly delivers dramatically better performance than Claude Opus 4.6 on coding, academic reasoning and cybersecurity tasks, raising concerns about unprecedented cyber risks. The incident underscores both the dual-use danger of advanced AI in areas like DeFi security and the irony that a company touting cutting-edge cybersecurity capabilities exposed details of its own model through a basic content management error.