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, you’re in the test group

holy fuck anthropic, you guys are unbearable sometimes

🥔🥔🥔 (@argofowl): if fable felt dumber this week, it’s not you ❗❗❗

since 2.1.237 the model reads “high” effort as 10 out of 100, the exact number “low” used to be

and the changelog doesn’t say a word

i spent my whole afternoon convinced t3 code and my own app were broken before i went