Anthropic appears to be A/B testing reduced effort levels in Claude Code

update: it's server-side, not the app

anthropic enrols fable 5 sessions on claude code 2.1.236+ into an experiment that shrinks the effort scale, older versions and opus 5 are left alone

probably an a/b test, so not everyone will see it

if "high" feels like "low" for you,
211 points by matthieu_bl 60 days ago twitter.com 185 comments

Summary

Anthropic is conducting an A/B test on its Claude Code system, adjusting effort levels for some users while leaving others on older versions. This change could impact how developers interact with the tool, making it essential for users to be aware of potential differences in experience.

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