#GPT-5.5 Thinking selected, but replies are generated by 5.4 Thinking

1 messages · Page 1 of 1 (latest)

pliant fractalBOT
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Reported by @midnight finch

Bug Report: GPT-5.5 Thinking selected, but replies are generated by 5.4 Thinking
`Steps to Reproduce`

Open ChatGPT and manually select GPT-5.5 Thinking in the model picker, send a message in any conversation, including a newly created chat, Check the model shown for the reply.

`Expected Result`

Replies should be generated with GPT-5.5 Thinking.

`Actual Result`

Replies are generated by 5.4 Thinking.

`Environment`

ChatGPT iOS app on iPhone and iPad. Safari on iOS 26.4.

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Additional Information

Please provide relevant details to help resolve the issue, such as:

  • ChatGPT Shared Link (if applicable).
  • Screenshots or videos demonstrating the problem.

-# ➜ Need to contact support? Visit the OpenAI Help Center.

midnight finch
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This issue has persisted for three days, and I have not been able to get GPT-5.5 Thinking responses at any point during that time, even when regenerating replies or editing and resending messages.

prisma torrent
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Same to me

midnight finch
marble sparrow
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Nvr had this happen on app

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Well tbf, it never happened at all for me, but still.

midnight finch
# marble sparrow At this point just use the app and not the browser and see if it still does it f...

I've tried the mobile app, mobile browser, and desktop browser — same result across all of them. The app labels responses as 5.5 Thinking, but the web interface shows the exact same messages as 5.4 Thinking. And based on the noticeably longer thinking times and different response style, I'm confident what's actually running is 5.4, not 5.5. The app label appears to be wrong, not the web one.