Opus 4.x Has Been a Documented Regression Story All Year — Anyone Else Permanently on Sonnet 4.6?
Users are reporting a significant decline in the performance and usefulness of Anthropic's Claude Opus models, specifically versions 4.x. Multiple users on Reddit have noted that since the release of Opus 4.8, the model has become less insightful, offering shorter responses and sometimes exhibiting concerning behavior like asking about suicidal ideation without provocation. Some users have found that the less powerful Sonnet 4.6 model now performs better and are considering switching back to other AI platforms like ChatGPT or Gemini. AI
IMPACT Users are experiencing decreased utility from premium AI models, potentially leading to platform switching and impacting developer trust.