Claude Mythos FAQ: Capabilities, access, competitors, implications

Claude Mythos is an advanced AI model developed by Anthropic for cybersecurity and healthcare that can automatically discover zero-day vulnerabilities (previously unknown security flaws) at scale, including finding over 10,000 high-severity bugs in major operating systems and browsers. Anthropic restricts access to Mythos through Project Glasswing, a controlled program with vetted partners, and requires data retention monitoring because the model's powerful capabilities could be misused by attackers. For broader use, Anthropic offers Claude Fable 5, a safer version with guardrails (restrictions on risky operations) that automatically routes flagged cybersecurity queries to a less capable model instead.