How-ToDevelopersSeptember 26, 2026

Claude Code effort levels explained, tested on Opus 5.5 and Fable 5.1

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Anthropic's Thariq Shihipar tested three builds and Terminal-Bench 3.0 to explain when to use each effort level in Claude Code. Higher effort raises benchmark scores and token use, helping most in hardware, code review, and security work.

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