#ChatGPT GPT-5 pro model switching back to normal without user consent

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shrewd belfryBOT
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Reported by @hot mesa

Bug Report: ChatGPT GPT-5 pro model switching back to normal without user consent
`Steps to Reproduce`
  1. Start a conversation with GPT-5 Pro selected.
  2. Submit a query, the first query is processed with GPT-5 pro
  3. The model selection automatically switches after the first message and goes back to GPT-5 auto.
`Expected Result`

I expect the GPT-5 Pro model to be sticky when selected for a thread. I keep on screwing up the follow-up messages because it replies with GPT-5 auto. So I have to re-do the entire thing.

`Actual Result`

Instead, my first reply is a PHD grade reply.
Then the second one (accidentally on auto) is an emoji filled 6th grader reply that screws up the entire conversation thread.

`Environment`

ChatGPT web interface