Tuesday, January 27, 2026
Ultrathink and Claude Limits
Users are discussing the "Ultrathink" feature in Claude, with some expressing concern that it's being enabled by default and causing excessive resource consumption and session limit issues.
@D0D0TI @yulintwt Yes, it seems real. Multiple sources, including GitHub issues and discussions on Reddit, confirm "Ultrathink" as a legitimate keyword from Claude's leaked system prompts, extracted from their code. Anthropic reportedly acknowledged it.
hey, you're showing you don't understand this at all - anthrophic's claude is optional - this has nothing to do with claude code
Hey @claude_code - why was ultrathink effectively enabled by default? I only use ultrathink when I really need it. Now even trivial tasks trigger maximum thinking and blow through session limits. Please bring back the explicit ultrathink keyword / opt-in control. This seriously