Anthropic releases Claude Fable 5 with strict safeguards, sparking backlash from researchers
Anthropic unveiled Claude Fable 5, its first publicly available Mythos-class AI model, with unprecedented safety restrictions on cybersecurity, biology, and chemistry topics. The model automatically routes sensitive queries to an older version, Claude Opus 4.8. While Anthropic says the guardrails prevent malicious use, cybersecurity researchers complain the restrictions are overly broad, blocking even routine code reviews and security work.