Technology & Science

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Anthropic Publicly Releases Guard-railed Mythos-class Model “Claude Fable 5”

On 9 June 2026 Anthropic moved its most capable AI beyond closed trials by shipping Claude Fable 5—a Mythos-grade system that automatically downgrades high-risk queries to Opus 4.8—thereby giving paying users frontier‐level performance while claiming a safety margin that satisfied internal red-team and 1,000-hour external testing.

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