Story perspectives

Anthropic's Claude Mythos Leaked via Discord, Security Risks Loom

4/24/2026

Summary

Story summary

Anthropic confirmed a small Discord group accessed its Claude Mythos preview model without authorization.
Anthropic is investigating the breach, which occurred via a third-party vendor on the same day the model was released to about forty companies.
Security experts warned the leak was inevitable and that U.S. adversaries like China may already have the model, raising cyber-attack risks, after the group said it used Mythos continuously with no malicious intent.

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Story summary

Anthropic confirmed a small Discord group accessed its Claude Mythos preview model without authorization.
Anthropic is investigating the breach, which occurred via a third-party vendor on the same day the model was released to about forty companies.
Security experts warned the leak was inevitable and that U.S. adversaries like China may already have the model, raising cyber-attack risks, after the group said it used Mythos continuously with no malicious intent.