How much better is it than Claude? I have both but Claude sucks up so many tokens.

5.5 is absolutely comparable to opus 4.7 (both on highest effort), maybe even better. It generally seems less lazy, faster, and writes code closer to what I'd write. The only downside is that for very very long tasks, it can kind of lose track of the goal. For tasks under ten minutes I'll go with codex every time.

Less gibliterrating and more doing

Very fast