Domain 5Projects, Context & Advanced Configuration
Opus
TL;DR
The most powerful model, reserved for deep research, complex reasoning, and long-document analysis where accuracy and nuance are critical.
Definition
The most powerful model, reserved for deep research, complex reasoning, and long-document analysis where accuracy and nuance are critical. Opus consumes significantly more rate limit than Sonnet or Haiku. Using it for simple tasks wastes your allocation for no quality gain.
Exam Context
Know that Opus is correct only for tasks requiring genuine deep reasoning. "Always use Opus for best quality" is a trap — it wastes rate limits on tasks that Sonnet handles equally well.