Claude AI Deprecates Ultrathink Keyword, Replaces with Extended Thinking System
By
moona3k
Master baker tier. Every paragraph earns its place on the tray.
Summary
The article discusses the deprecation of the 'ultrathink' keyword in Claude AI models and reveals its replacement with 'extended thinking' functionality. It explains how users previously used 'ultrathink' to access maximum reasoning tokens (31,999 thinking tokens) and how the new system works. The article also shares a hidden trick to potentially get twice the thinking budget on 64K output models, providing technical insights into how Claude's reasoning system operates under the hood.
Key quotes
· 5 pulledRemember ultrathink? The magic keyword that unlocked Claude's maximum reasoning power? It's deprecated.
For months, ultrathink was the magic word. Add it to your prompt, get 31,999 thinking tokens.
Hacker News threads debated its effectiveness. Power users swore by the 'Opus + Ultrathink + Plan Mode' combo.
But here's what replaced it — and a hidden trick to get twice the thinking budget on 64K output models.
Under the hood, Claude Code detected the keyword and set the thinking budget.
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