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Anthropic's Fable 5 and Mythos 5 Are Back with New Security Guardrails

·Source: Infosecurity Magazine

Updated:

Executive Summary

The new classifier in Fable 5 blocks the jailbreak technique that prompted the US export controls “in over 99% of cases”

Analysis

The new classifier in Fable 5 blocks the jailbreak technique that prompted the US export controls “in over 99% of cases”
Source Attribution

Originally published by Infosecurity Magazine on Jul 1, 2026.

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