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Japan’s Mythos Response ’Must Involve Big Tech,’ Says LDP Cybersecurity Chief

Anthropic now allows partners to share vulnerability findings more broadly as Project Glasswing matures, while about 50 companies participate in the program.

  • Anthropic announced Monday it is revising its position to allow users of its Claude Mythos Preview cybersecurity model to share threat information with external parties, ending strict confidentiality requirements for Project Glasswing participants.
  • Project Glasswing grants about 50 organizations including Amazon, Microsoft, Nvidia, and Apple access to the unreleased Mythos model, though participants initially faced strict secrecy requirements regarding vulnerability identification.
  • Cloudflare's chief security officer Grant Bourzikas demonstrated how the model chains low-severity bugs into severe exploits. Anthropic stated that as the program matured, it adapted agreements to ensure key information can be shared broadly.
  • Partners may now disclose findings to security teams, regulators, and the public, subject to responsible-disclosure norms. An Anthropic spokesperson noted that confidentiality protections were originally built into agreements at the request of partners.
  • Democratic Representative Josh Gottheimer previously urged Anthropic to remove contractual restrictions on warning others about cyber risks. Meanwhile, OpenAI launched a similar, less secretive program called Daybreak, allowing broader access to its cybersecurity model.
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The Economic Times broke the news on Tuesday, May 19, 2026.
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