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The announcement

Welcome: why this launch is different

What 'Mythos-class' actually means

Quick check: the Mythos tier

Two models, one launch

Fable 5 and Mythos 5: same brain, different guardrails

Project Glasswing: the preview that came first

Quick check: two models

$ (USD)

On June 9, 2026, Anthropic did something it had never done: it released a Mythos-class model to everyone. This module unpacks what that sentence actually means — the capability tier, the two models that shipped together, and why the announcement mattered.

The Launch: What Claude Fable 5 Is

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