Anthropic is opening access to its most powerful artificial intelligence model, Claude Mythos, to roughly 150 new organizations, one day after the company confidentially filed for a public offering. The expansion adds partners across more than 15 countries to Project Glasswing, a controlled program designed to find and patch software flaws before the model reaches the public. Each new partner must clear security requirements before gaining entry. An initial group of about 50 organizations joined in April, including Google, Microsoft, Palo Alto Networks, and JPMorganChase, and those early users have flagged more than 10,000 high or critical software vulnerabilities. The fresh wave brings the total to roughly 200 and spans power, water, healthcare, communications, and hardware sectors. A single breach at one of these firms, the company estimates, could harm well over 100 million people. Researchers and government agencies have questioned whether such a capable model could make complex cyberattacks easier, while Anthropic argues defenders need sharper tools. The U.K. AI Security Institute documented a 32-step simulated network attack the model ran on its own. Mozilla reported that Mythos found 271 vulnerabilities it then fixed in the Firefox browser, and startup Calif described an exploit chain aimed at Apple's M5 chips. Anthropic has released Claude Security, a tool that has patched more than 2,100 flaws in three weeks. On the prediction market Myriad, odds of a public release by the end of June have slipped to