ultrathink keyword returns to Claude Code CLI after brief removal
lydiahallie · x · 2026-10-29
The ultrathink keyword is back in the Claude Code CLI. Anthropic had turned it off for a while because it seemed "weird and maybe confusing," but the team decided to re-enable it. The poster says they mostly run Opus 5.5 on medium effort, and adds ultrathink on turns where they want extra reasoning.
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