Anthropic releases Mythos-class Fable 5 globally and restricted Mythos 5
Anthropic released Claude Fable 5 globally with topic safeguards and gave selected cyber defenders access to Claude Mythos 5, the same underlying model with cyber safeguards lifted.
TOWARD DOOM84confidence 99/100
Why it moved the index
Anthropic made Mythos-class capability generally available for the first time while separately deploying its strongest cyber configuration with safeguards removed to a restricted partner group.
AUDIT TRAIL
Assessment history
- R1Toward 84 · confidence 99
New joint launch story for two already authoritative exact-version model records.
11 Aug 2026