Previously rendered text vertically jitters while responses are streaming
What version of the Codex App are you using (From “About Codex” dialog)?
ChatGPT — Powered by Codex & OWL, Version 26.727.51351 (Published July 31, 2026)
What subscription do you have?
ChatGPT Plus
What platform is your computer?
Windows 11, x64; display resolution 1280 × 1024
What issue are you seeing?
In the ChatGPT Windows desktop app, text that has already been rendered repeatedly moves up and down by approximately one pixel while a response is being generated.
This occurs in regular ChatGPT conversations, not only in Codex tasks. It is not normal scrolling or simply new text appearing below. Previously rendered paragraphs visibly jitter several times per second, making them uncomfortable to read and causing visual strain. Closing the left sidebar does not fix the problem.
Actual behavior: previously rendered text continuously jitters vertically during response generation.
Impact: the repeated movement seriously affects readability and accessibility, even though the displacement is only around one pixel.
What steps can reproduce the bug?
- Open the ChatGPT Windows desktop app.
- Start a regular ChatGPT conversation.
- Request a long response.
- While the response is streaming, focus on a paragraph that has already appeared.
- Observe that the existing text repeatedly shifts slightly up and down several times per second.
- Close the left sidebar and repeat. The issue remains.
What is the expected behavior?
Previously rendered text should remain completely stationary while new text is added below.
Additional information
The issue is reproducible in the Windows desktop app version listed above on a 1280 × 1024 display. The movement is approximately one pixel vertically and repeats during streaming. It occurs in regular ChatGPT conversations and is not resolved by closing the left sidebar.
https://youtu.be/YPXqw7lsz5g?si=nq83kwdpaLfW8jFa&t=16
Link a YouTube video.
[](https://youtu.be/YPXqw7lsz5g?si=nq83kwdpaLfW8jFa&t=16)