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Claude Fable 5 Is Here: The First Public Mythos-Class Model
Anthropic released Claude Fable 5 on June 9, 2026, the first Mythos-class model anyone can use
The Lab · Written in the open · Tagged AI News
Working notes from the studio. The tools I build, the workflows I keep, the mistakes I paid for.
2 entries · latest 2026-06-15
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Anthropic disabled Claude Fable 5 and Mythos 5 on June 12 under a US export order over a jailbreak. What happened, why, and the Opus 4.8 fallback I use.
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8 min read
Anthropic released Claude Fable 5 on June 9, 2026, the first Mythos-class model anyone can use