docs: Claude Code v2.1.257 - Claude Fable 5.1 is now the default, Containment Escape auto-mode security rule, 60+ fixes - #1236

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Sep 1, 2026

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docs: Claude Code v2.1.257 - Claude Fable 5.1 is now the default, Containment Escape auto-mode security rule, 60+ fixes

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