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← Back to all updatesPublished ·Anthropic◆ Critical
Anthropic removed model card content naming Claude Fable 5 and Claude Mythos 5.
The read
Treat Anthropic model routing references to Fable 5, Mythos 5, and Opus 4.8 as needing verification.
The frame
The removed text described Fable 5 as widely released and Mythos 5 as Project Glasswing availability.
Primary source
Anthropic modelcard →Keep reading
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