#ChatGPT 5 Thinking no reasoning at all and falls back to 4.1-like

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thorn pantherBOT
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Reported by @craggy adder

Bug Report: ChatGPT 5 Thinking no reasoning at all and falls back to 4.1-like
`Steps to Reproduce`

Just use it on one of my device.

`Expected Result`

An output with reasoning appearing first.

`Actual Result`

No reasoning at all. If I ask it "what model you are" it tells me GPT4. If I'm using it on another device or on Android app then it works normally. If I switch on deep research, it only appears as a regular result with web search.

`Environment`

Linux x64, Firefox 142

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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.

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