Model selection flip flops

I started two sessions side by side, trying out sonic compared to sonnet. While I'm chatting, the model selection keeps flip flopping between them.

I started with sonic and sonnet in two side by side sessions. I didn't change models since session start.
Now both windows say sonic.

I'm pretty sure the model used in the second window is still sonnet, but the label is wrong.

This issue might be a duplicate of existing issues. Please check:

does not remember the last choosen model and ignores the model in opencode.json #1433: [does not remember the last choosen model and ignores the model in opencode.json] - Similar issue where model selection doesn't persist correctly, especially when using multiple sessions
opencode run command uses incorrect model after /models selection #736: [opencode run command uses incorrect model after /models selection] - Related issue where model selection state isn't maintained properly between different opencode invocations
Model switch automatically when changing the mode #1661: [Model switch automatically when changing the mode] - Similar behavior where model selection changes unexpectedly, particularly when switching between modes
Inconsistent Session Token Count #1937: [Inconsistent Session Token Count] - While focused on token counting, multiple users reported similar UI synchronization issues across sessions

Feel free to ignore if none of these address your specific case.

Note: duplicate of existing #1661

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