These specific phrases are mapped directly to increasing levels of thinking budget in the system: "think" < "think hard" < "think harder" < "ultrathink." Each level allocates progressively more thinking budget for Claude to use.
https://simonwillison.net/2025/Apr/19/claude-code-best-practices/
Claude Code: Best practices for agentic coding
Extensive new documentation from Anthropic on how to get the best results out of their [Claude Code](https://github.com/anthropics/claude-code) CLI coding agent tool, which includes this fascinating tip: > We recommend using …
simonwillison.net
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