According to @claudeai, biology fallbacks dropped ~85%, expanding safe help for health and education while dual‑use queries still route to Opus 5.

According to @galnagli, Opus 5 excels at web hacking but struggles at coding, surfacing critical vulns and noisy code output, per posts on X.

According to Ethan Mollick, Opus 5 outperforms 4.8 but inherits Fable-like dense prose, showcased in a Middle Earth railroad game demo.