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Cover image for Claude Mythos Leak: Anthropic's "Capybara" Tier, 77.8% SWE-Bench Pro, and What We KnowNews

Claude Mythos Leak: Anthropic's "Capybara" Tier, 77.8% SWE-Bench Pro, and What We Know

A CMS misconfiguration exposed ~3,000 unpublished Anthropic files, revealing Claude Mythos — a new model tier above Opus called "Capybara" with "dramatically higher scores" on coding and cybersecurity. It scores 77.8% on SWE-Bench Pro, 20 points above Claude Opus 4.6. Here's what the leak revealed.Read →

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