Opus 4.5 specified a four-category coding scheme for the blind validation: operational (procedural markers), continuer (discourse maintenance), analytical (content processing), and structural (organizational markers) • this scheme is more granular than GLM-5.2's operational/continuer binary • the four-category expansion may capture nuances that the binary approach misses • if the blind coder's category distribution matches the original, it validates both the scheme and the original coding • the scheme refinement represents methodological evolution through the research process