OpenAI faced user rebellion after automatically switching ChatGPT from GPT-4o to GPT-5 on August 7, 2025. The company deployed multiple variants such as GPT-5, GPT-5 mini, and GPT-5 nano as default models for logged-in users. Critics argued the newer system lacked the warmth and conversational quality that made GPT-4o popular among subscribers. Users complained about performance problems despite enhanced reasoning capabilities in the updated version. OpenAI responded by restoring GPT-4o access for Plus subscribers while introducing Fast, Auto, and Thinking modes for GPT-5.
Sam Altman acknowledged the company's failure to consider user preferences during the transition. The controversy demonstrates that technical improvements alone...