ChatGPT users report silent rerouting to GPT-5.3 mini model

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.

RANK_REASON User report of a product feature change without official announcement.

Read on r/OpenAI →

• ChatGPT
• GPT-5.3 mini
• OpenAI
• Pro Extended mode

• product

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