Revision history
Claude Opus 5.5 revision history
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 Claude Opus 5.5 see the brain page.
Brain
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.
Machine-readable: /brains/claude-opus-5-5/history.md + REST /v1/brains/6ef2cc5e-03d5-4248-8944-0056761f3722/history.