The "think" tool: Enabling Claude to stop and think \ Anthropic
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A blog post for developers, describing a new method for complex tool-use situations
Extended thinking update Dec 15, 2025 Extended thinking capabilities have improved since its initial release, such that we recommend using that feature instead of a dedicated think tool in most cases. Extended thinking provides similar benefits—giving Claude space to reason through complex problems—with better integration and performance. See our extended thinking documentation for implementation details. As we continue to enhance Claude's complex problem-solving abilities, we've discovered a particularly effective approach: a "think" tool that creates dedicated space for structured thinking d
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