ChatGPT Pro After GPT-5.6: When “Abuse Protection” Becomes Quality Destruction

A ChatGPT Pro subscriber since its launch, the user reports consistent performance through the GPT-5.5 period. However, following the release of GPT-5.6, a significant decline in quality was observed. The user finds this quality degradation, attributed to "Abuse Protection," unjustifiable at the current price point and states they will not renew their ChatGPT Pro subscription.

This report is from a long-term ChatGPT Pro subscriber, unlike many complaints from new users, and specifically links the quality decline to the GPT-5.6 update.