Claude on X: “We’re introducing Claude Fable 5.1 and Claude Mythos 5.1. They're the …”

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Claude

@claudeai

We’re introducing Claude Fable 5.1 and Claude Mythos 5.1.

They're the world’s most advanced models for coding and knowledge work.

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Sep 1, 2026, 6:03 PM UTC

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Claude on X: “We’re introducing Claude Fable 5.1 and Claude Mythos 5.1. They're the …” | PeekX