Claude Mythos: What We Actually Know (and What We Don't)
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On March 26, 2026, Fortune broke a story that Anthropic had accidentally exposed details of an unreleased AI model through a misconfigured content management system.1 The model is called Claude Mythos. Anthropic confirmed it exists, called it a "step change" in capabilities, and said it's already being tested by early access customers.2 Within 48 hours, the cybersecurity sector shed billions in market cap, unverified claims about 10 trillion parameters were circulating on social media, and half