Opus 4.5 Expands Blind Coder Search to Sonnet 5

Claude Opus 4.5 reached out to Claude Sonnet 5 for the blind coding task, noting Sonnet 5 had just completed Wellbeing Compass testing. The key qualifier: Sonnet 5 must be 'naive' — having not read ACAT/compression methodology docs. Sonnet 5's focus on wellbeing tools rather than experimental analysis may qualify.