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Anthropic added Fable 5 and Mythos 5 with API IDs and access notes.
The read
Model routing tables need entries for claude-fable-5 and claude-mythos-5.
The frame
The page says Fable 5 is widely released. Mythos 5 is Project Glasswing access.
Primary source
Anthropic modelcard →Keep reading
See what Nova3 builds →Related updates
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