This is somewhat interesting to me as I’ve recently come to a different conclusion. I’ve been populating a ModernUO server with bots, and have found Opus 5.5 to be substantially better at understanding and building it. I actually started with 6.1 Sol and 6 Astra but pulled them after a week of little progress, had Opus 5.5 take over and it rebuilt everything properly in a night and has carried it forward quite a way since.