New ChatGPT App - Scrolling Issues

What version of the Codex App are you using (From “About Codex” dialog)?

26.803.61601

What subscription do you have?

ChatGPT Plus

What platform is your computer?

macOS 27.0 26A5406e (Darwin 27.0.0 arm64)

What issue are you seeing?

Scrolling behaves very weirdly in the new ChatGPT app vs ChatGPT Classic. I want to show a side by side comparison here (New ChatGPT on the left, ChatGPT Classic on the right). It's difficult to read along with the new ChatGPT app as it continues to scroll even when it doesn't need to, moving content up out of the view causing a huge gap of empty space at the bottom. This is only observable in regular chats, not in Work/Codex.

https://github.com/user-attachments/assets/1c242bbe-d3dc-468b-b14e-1197eb989871

What steps can reproduce the bug?

1. Open both apps side by side.
2. Start a new regular chat in both and type "type exactly 500 words" then do it again to see how scrolling behaves in both.

What is the expected behavior?

It should behave how it did in the old ChatGPT Classic app.

Additional information

This is honestly the main reason keeping me from using the new app day to day, it's pretty much impossible to read along with what ChatGPT is doing, you have to constantly scroll up after every single message, it's very annoying.

Start by reproducing the issue in a regular chat on macOS using the listed 500-word prompt, comparing the new ChatGPT app with ChatGPT Classic. Investigate the regular-chat scrolling entry point, keeping Work/Codex behavior separate; done means generated content stays readable without unnecessary scrolling or a large empty gap at the bottom.