# Cybersecurity

- [Claude Mythos Goes Official: Project Glasswing and the Zero-Day Reckoning](https://sdd.sh/2026/04/claude-mythos-goes-official-project-glasswing-and-the-zero-day-reckoning.md): Anthropic officially unveiled Claude Mythos Preview on April 7, confirming what the March leak hinted at: a model that autonomously found thousands of zero-days across every major OS and browser. Their response — Project Glasswing — grants restricted access to a select group of tech giants to use Mythos as a defensive weapon. This is the most consequential 'too dangerous to release' moment in AI history.
- [GPT-5.3-Codex: The First AI Model That Helped Build Itself — and Got a Scary Security Rating](https://sdd.sh/2026/03/gpt-5.3-codex-the-first-ai-model-that-helped-build-itself-and-got-a-scary-security-rating.md): OpenAI's GPT-5.3-Codex was instrumental in creating itself, introduced mid-turn steering for agentic workflows, and became the first OpenAI model rated 'High capability' for cybersecurity — which means it can reliably exploit real vulnerabilities.