Pick the model, then the effort

Opus 5.5

medium effort

My default for almost everything.

Fable 5.2

Claude Ultra plan

The hardest problems: design, tricky bugs.

Haiku 5.5

low effort

Quick, cheap searches across many files.

Codex

high effort

Reviews every pull request.

Effort is how long it thinks before it answers. More effort: slower, smarter, costlier.

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