I am being silently rerouted to GPT-5.3 mini when using Pro Extended mode on ChatGPT webapp
Users of OpenAI's ChatGPT have reported being silently rerouted to a model identified as "GPT-5.3 mini" when using the "Pro Extended mode" on the web application. This change in model behavior reportedly began occurring recently, leading to user confusion and questions about the underlying model being utilized. AI
IMPACT Potential confusion for users regarding the AI model they are interacting with.