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Fable 5 Is Here. The AppSec Problem Hasn’t Changed.

calendar_today June 10, 2026 person Yoav Stahl domain legit-security

Anthropic’s release of Fable 5 yesterday has reignited discussion about what AI means for cybersecurity. That’s understandable given the model is derived from Mythos, which remains restricted because of its advanced capabilities in areas including vulnerability research. When the company building the technology is cautious about how broadly it should be deployed, security teams should pay attention.

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