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Anthropic modelcard now lists Claude Fable 5 and invitation-only Claude Mythos 5.
The read
Model routing tables need new Anthropic IDs and access gating separated for Fable 5 and Mythos 5.
The frame
Fable 5 uses claude-fable-5. Mythos 5 uses claude-mythos-5 and sits inside Project Glasswing.
Primary source
Anthropic modelcard →Keep reading
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