RDLTR

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One line. Many voicesSeek and you shall find

decodeclaude.com faviconUltraThink is Dead. Long Live Extended Thinking. — Decode Claude

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The `ultrathink` keyword is deprecated in Claude Code; extended thinking is now default with 31,999 tokens, and a hidden `MAX_THINKING_TOKENS=63999` unlocks 63,999 tokens on 64K output models.