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Anthropic lists Claude Fable 5 and Claude Mythos 5 on its model overview.
The read
Builders get Claude API IDs and availability notes for widely released and Project Glasswing models.
The frame
Fable 5 is positioned above Opus 4.8 for highest available capability. Mythos 5 is listed under Project Glasswing.
Primary source
Anthropic modelcard →Keep reading
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