Claude Sonnet 4 Extended Thinking
Claude Sonnet 4 (Extended Thinking) is the long-deliberation mode of Sonnet 4. It spends extra tokens “thinking” before answering, boosting accuracy on hard reasoning, math, and coding while keeping the same strengths—long context, tool/function calling, JSON outputs, and multimodal text-plus-image understanding.
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- Closed
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About Anthropic
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Anthropic develops reliable and interpretable artificial intelligence systems, including the Claude family of AI assistants.