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Published ·Anthropic◆ Critical

Anthropic removed Claude Fable 5 and Mythos 5 modelcard content.

The read

Builders should verify model IDs, access paths, and provider availability before routing traffic.

The frame

The removed text named claude-fable-5, claude-mythos-5, Project Glasswing, and June 9, 2026 availability.

Primary source
Anthropic modelcard
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