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

Anthropic is A/B testing reduced effort levels in Claude Code, affecting sessions on version 2.1.236+ with the change applied server-side. The experiment shrinks the effort scale, while older versions and Opus 5 remain unchanged, and not all users will see the change.

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, you're in the test group holy fuck anthropic, you guys are unbearable sometimes