I am being silently rerouted to GPT-5.3 mini when using Pro Extended mode on ChatGPT webapp
A ChatGPT user reported being silently rerouted to GPT-5.3 mini when using Pro Extended mode. The unexpected behavior started occurring today. The cause and extent of the rerouting are unclear. You may want to verify your ChatGPT usage and settings.
Key takeaways
- GPT-5.3 mini is being used without explicit user selection.
- The issue started today according to the user.
- Pro Extended mode is affected.