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
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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