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129129### Effort level
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131A setting that controls how much of the adaptive-reasoning thinking budget Claude uses on each turn. Higher effort means more thinking tokens and deeper reasoning; lower effort is faster and cheaper. Effort is supported on Fable 5.1 and Fable 5, on Opus 4.6 and later, and on Sonnet 4.6 and later.
131A setting that controls adaptive reasoning, which lets the model decide whether and how much to think on each step. Higher effort means more thinking tokens and deeper reasoning; lower effort is faster and cheaper. Effort is supported on Fable models, on Opus 4.6 and later, and on Sonnet 4.6 and later.
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133133Learn more: [Adjust effort level](/docs/en/model-config#adjust-effort-level)
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