# Claude Fable 5.1 revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Brain: [Claude Fable 5.1](/brains/claude-fable-5-1.md)

_No events on file. Arc G is forward-only; the recorded event log accrues from Arc G adoption (2026-06-04). For the current state of this brain, see the brain page._

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date.

_Canonical URL: /brains/claude-fable-5-1/history. REST: /v1/brains/42be8c34-3477-4c18-a4ad-b192f6e43609/history. HTML: [/brains/claude-fable-5-1/history](/brains/claude-fable-5-1/history)._