Anthropic relaxes Mythos confidentiality rules

Anthropic said on May 18 that it had changed the confidentiality rules around its Mythos cybersecurity model to let users share threat information with other organizations facing similar vulnerabilities. The company had previously limited what partners could disclose from work done with Mythos, a gated research-preview model it launched on April 7 for defensive security use cases. Reuters reported the revised position allows users to pass along findings about cyber threats to others who may be exposed. Anthropic has framed Mythos as part of a broader effort to secure critical software through a partner program called Project Glasswing. ### What exactly changed in Anthropic’s rules? Reuters reported on May 18 that Anthropic was revising its earlier position so users of Mythos could share information about cyber threats with others who might face the same weaknesses. That is a narrower change than opening the model broadly: Mythos remains a gated preview, and Anthropic’s public materials still say access is prioritized for defensive cybersecurity work. (money.usnews.com) Amazon Bedrock’s model card for Claude Mythos Preview says the model has been available only as a gated research preview since April 7, with access focused on cybersecurity, autonomous coding and long-running agents. Anthropic’s Project Glasswing materials likewise describe early access for organizations using the model to find and fix vulnerabilities in critical systems. (money.usnews.com) ### Where does Mythos fit inside Anthropic’s broader cyber push? Anthropic launched Project Glasswing on April 7 as a coalition built around Claude Mythos Preview and critical-software defense. The company said the program brought together Amazon Web Services, Microsoft, Apple, Broadcom, Cisco, CrowdStrike, Google, JPMorganChase, the Linux Foundation, NVIDIA and Palo Alto Networks as launch partners. Anthropic also said it had extended access to more than 40 additional organizations and committed up to $100 million in usage credits and $4 million in donations to open-source security groups. (docs.aws.amazon.com) Anthropic’s public description of Glasswing says launch partners are using Mythos Preview in defensive security work and that Anthropic will share what it learns so the wider industry can benefit. The May 18 rule change reported by Reuters pushes that sharing one step further by allowing partner organizations themselves to pass along relevant threat information. That is an inference from the two documents read together, rather than a separate Anthropic statement using those exact words. (anthropic.com) ### Why were Amazon and Microsoft named in this story? Amazon Web Services and Microsoft were already listed by Anthropic as Project Glasswing launch partners before the May 18 change. Anthropic’s Glasswing page says AWS has been testing Mythos Preview in its own security operations and applying it to critical codebases. Reuters identified Amazon and Microsoft as examples of the companies that could share threat information under the revised approach. (money.usnews.com) AWS separately lists Claude Mythos Preview on Amazon Bedrock as a preview model. That listing does not address the confidentiality revision directly, but it confirms AWS is one of the channels through which organizations can access the model under Anthropic’s controlled rollout. ### Does this mean Anthropic is loosening access to Mythos itself? Anthropic’s public documents do not say Mythos is becoming generally available. (anthropic.com) The Bedrock model card still describes it as a gated research preview, and Project Glasswing still presents the model as an early-access tool for a defined group of security partners and additional infrastructure organizations. (docs.aws.amazon.com) Anthropic’s next public milestones remain tied to the Glasswing rollout and Mythos documentation already posted on its site. As of May 19, the company’s Project Glasswing page still lists Amazon Web Services and Microsoft among the named launch partners, and Amazon Bedrock still shows Claude Mythos Preview as a preview model launched on April 7. (anthropic.com) (docs.aws.amazon.com)