Good thoughts from @edent.tel on closing open-source repos because Mythos:
https://shkspr.mobi/blog/2026/04/does-mythos-mean-you-need-to-shut-down-your-open-source-repos/
I would strongly recommend reading the UK’s AI Safety Institute’s evaluation of Claude Mythos Preview’s cyber capabilities and the NCSC’s advice. Neither of them recommend closing down Open Source code.