- In short
- Opus fits tasks with genuinely complex judgment or multi-layered, ambiguous inputs, and high-stakes output where the quality ceiling matters more than turnaround time. It trades speed for depth of reasoning compared with Haiku and Sonnet. Opus is reserved rather than default, because most work does not need its full capability, so the trigger is genuine ambiguity or consequence, not merely a task that sounds important or a document that is long.
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