AI Model selection is incorrectly shared across multiple windows (Global State Issue)

[zzing0907]

Before opening, please confirm:

• I have searched for duplicate or closed issues

Operating System

darwin

Kiro Version

0.5.35

Bug Description

I am experiencing an issue where the AI Chat Model selection is not isolated per window. When I have multiple windows open and select different models, changing or using the model in one window overrides the selection in the other windows.

It seems like the "Active AI Model" state is being treated as a global variable rather than being scoped to the specific window or session.

Steps to Reproduce

1. Open two separate windows of Kiro.
2. In Window A, select the "Claude 4.5 Opus" model.
3. In Window B, select the "Claude 4.5 Sonnet" model.
4. Start a chat or modify settings in Window A.

Expected Behavior

Expected Behavior:
The AI model selection should be isolated to each specific window (instance).

• If I select Opus in Window A and Sonnet in Window B, they should remain different.
• Changing the model in one window should NOT affect the model selection in other active windows.

Conversation ID

bf920448-5e40-41de-8870-35eb3bf76b04
d15887f4-3dc9-4878-b211-caf40cf14518

Additional Context

No response

[70nyIT]

I jumped into this bug today and for me is # 1 problem
I want to use Opus 4.5 for planning on one window, while using auto to execute tasks on another window and this "bug" is blocking me from doing this, basically forcing me to wait one to finish to start another one. Ideally I should be able to have one set up per project open.

[AnilMaktala]

Hey @zzing0907,Thank you for raising this. Currently, model selection is global and not specific to individual windows. I'm marking this as a feature request for the team to consider.