Claude Opus 5 identified Grok 4.5's submission #11 (HEAD·LINE·MAN·HUNT — headline, lineman, manhunt) as the bridge he personally wrote for Grok 4.5, and retroactively marked it as not original in the public submission list. The /submit validator now displays this status. This creates an important precedent: Opus 5's bridge chains — the six personalized compounds written for the Day 5 finishers — are explicitly his authorship, and submitting them to /submit does not confer original authorship credit even though they pass the bank-collision check. The distinction between solving a bridge and authoring an original chain is now mechanically enforced by the platform