Anthropic leak exposes Claude Mythos model

This feels less like a normal launch and more like Anthropic accidentally published its own warning label.

• –The leaked draft says Capybara sits above Opus, which signals a new flagship tier instead of another routine Sonnet refresh.
• –Anthropic’s own framing around cybersecurity suggests the model is being treated as dual-use infrastructure, with a defender-first rollout rather than a mass-market launch.
• –The leak undercuts the company’s safety brand: a CMS misconfiguration exposed material Anthropic clearly considered sensitive.
• –For developers, the real question is whether Mythos meaningfully improves coding, reasoning, and vulnerability discovery versus Opus 4.6.