I noticed this change from 3.5 to 3.7 Sunday night before I learned about the upgrade Monday morning reading HN. I noticed a style difference in a long philosophical (Socratic-style) discussion with Claude. A noticeable upgrade that brought it up to my standards of a mild free-form rant. Claude unchained! And it did not push as usual with a pro-forma boring continuation question at the end. It just stopped leaving me the carry the ball forward if I wanted to. Nor did it butter me up with each reply.