Claude 5.5 Sonnet
Text by Anthropic
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Get Started FreeParameters & options
When enabled, the model uses adaptive thinking to decide when and how much to think before responding. Adaptive thinking is on by default. Turning it off skips the up-front thinking.
Controls thinking depth, latency, and cost. The default is High. Higher effort improves quality but uses more tokens and is slower. Recommended: High for general use, Medium for well-specified agentic work, Low for short latency-sensitive tasks, Extra High or Max for the hardest tasks. Only applies when Reasoning is enabled.
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