Breaking! Claude Mythos and Capybara Accidentally Leaked
According to reports from Fortune and The Information, Anthropic accidentally exposed a large cache of internal assets due to a CMS misconfiguration. These documents reveal the development of Claude Mythos, a model that marks the debut of a new high-performance tier called "Capybara."
The Leaked Details
Performance: It is positioned as a "step-change" above Claude Opus 4.6 (which was just released in February). It allegedly achieves significantly higher scores in software coding, academic reasoning, and cybersecurity.
The "Capybara" Tier: This is a new, larger model class designed to be more "intelligent" and "connective" than the Opus tier.
Safety & Cyber Risks: Anthropic describes the model as having "unprecedented" cybersecurity capabilities—to the point that it could "presage an upcoming wave of models that can exploit vulnerabilities in ways that far outpace the efforts of defenders."
Release Strategy: Because of these risks and high compute costs, they are opting for a "gradual" rollout, starting with early-access for "cyber defenders" to help secure their codebases before the model (or similar ones) becomes widely available.
Capybara (The Tier): Chosen for the animal’s "social bridge" nature, it marks a move toward "connective intelligence"—models that don't just solve tasks but link disparate domains.
Mythos (The Model): Moving beyond a single "Opus" (masterpiece) to "Mythos" (a foundational worldview). It signals a model capable of understanding the deep, systemic "lore" of complex codebases and security infrastructures.