AI / Claude OPUS5 Interview questions
Describe the effort parameter in Claude Opus 5?
The effort parameter controls how much computational work Claude Opus 5 puts into a request - governing thinking depth as well as the depth of tool calls and arguments, not just visible response length - across levels typically described as low, medium, high, xhigh, and max.
Claude Opus 5 defaults to high effort on the API, and the specific amount of work each level represents was recalibrated relative to Opus 4.8, so a setting carried over unchanged from the prior model won't necessarily produce the same cost or behavior.
Because effort mainly governs thinking and tool-call depth rather than visible answer length, lowering it to save cost won't reliably make responses shorter - controlling response length requires an explicit instruction in the prompt instead.
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