Users Call Opus 5 AI Model Ignorant

Tweets from AI community members describe Opus 5 as an ignorant model that breaks code and systems. One builder contrasts it with Opus 4.8, which continues to perform reliably, and notes Fable delivers strong results. A separate researcher publicly asks why Fable continues to fall back on version 4.8 rather than version 5. The discussion centers on observed reliability gaps and deployment decisions without further clarification from the model providers or Fable maintainers.