According to God of Prompt on X, over 3,000 unpublished Anthropic files were publicly accessible due to a CMS misconfiguration, revealing references to a new model "Claude Mythos" and an internal tier above Opus called "Capybara," described as far ahead of any other AI model in cyber capabilities; Anthropic confirmed the leak and called the model a step change (according to God of Prompt and Anthropic statements cited in the thread). As reported by Bloomberg and The Information, the leak surfaced the same day both outlets said Anthropic is considering an IPO as early as October 2026, raising questions about timing and intent. According to market data cited in the thread, cybersecurity stocks including CrowdStrike and Palo Alto Networks fell 6–7%, the Global X Cybersecurity ETF dropped over 6%, and Bitcoin slid from $70K to $66K overnight. For AI industry stakeholders, the practical takeaways are: monitor whether Mythos is piloted first with cybersecurity defense clients, watch for standardized benchmarks to validate claimed cyber capabilities, and track any formal IPO timetable—each scenario carries distinct go-to-market and governance implications for enterprise security buyers. Sources: God of Prompt on X summarizing the leak, Anthropic confirmation as referenced in the thread, and IPO coverage from Bloomberg and The Information.