
Anthropic stated that Fable 5 includes invisible safeguards using prompt modification, steering vectors, or PEFT to limit its effectiveness for frontier LLM development. Both models share the same base model. Fable 5 ships with conservative safety guardrails for general use.
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Summary by ByteBrief
Anthropic's Mythos Safeguards Stoke Fears of a 'Permanent Underclass'