Anthropic deep dive: effort tuning in Claude Code pays off most for security and code review
trq212 · x · 2026-09-26
An Anthropic engineer published a hands-on explainer on how the effort parameter works in Claude Code: effort controls how much verification, edge-case testing, and independent judgment the model applies, without breaking the prompt cache.
Key findings:
- High effort delivers better results where verification matters most: hardware-adjacent code, code review, and security work
- Low/medium effort is ideal for routine tasks, saving compute without quality loss
The author validated this with internal evals and real-world testing; interactive diagrams are available on the claude.dev blog.
Related event: Anthropic Staff Explains How to Choose Claude Code's Effort Setting(5 posts)→
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