Anthropic · announcementClaude Fable 5 and Claude Mythos 5

valid_from

2026-06-09

valid_to

null (still holds)

confidence

0.50

superseded_by

null

first seen

2026-10-27

last updated

2026-10-28

Sources

• Claude Fable 5 and Claude Mythos 5primary · anthropic.com

/claim/clm_728A26147C80.md/v1/claims/clm_728A26147C80timelinesubmit a correction