Claude Opus 5 Explained: Effort, Context, and Cost for Engineers
A developer's look at Claude Opus 5: the effort parameter, thinking-on-by-default, the 1M-token context window, cache-safe tool changes, and how fallb...
Jul 25, 2026
21 min11
A developer's look at Claude Opus 5: the effort parameter, thinking-on-by-default, the 1M-token context window, cache-safe tool changes, and how fallb...