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Model randomly switches between concurrent sessions in the same project #52805
Description
Description
Description
When working in the same project with multiple sessions open, the model assigned to one or more sessions can unexpectedly change during an ongoing conversation.
For example:
Session A is using DeepSeek V4.1
Session B is using a Codex model through a subscription
Both sessions initially work with their individually selected models as expected. However, while continuing to use them, one of the sessions may suddenly switch to a different model without any manual model change.
The behavior does not appear to consistently affect only one session or one provider. It can happen to either session, and the model it switches to is not always the same.
Where it happens
I have reproduced this in both:
OpenCode CLI
OpenCode Desktop
I am currently using the v2 version.
Expected behavior
Each session should retain its own selected model independently.
If Session A is configured to use DeepSeek V4.1 and Session B is configured to use Codex, those model selections should remain unchanged unless I explicitly change them.
Actual behavior
During an active conversation, the selected model for a session can randomly change even though I have not changed the model manually.
This becomes particularly noticeable when multiple sessions belonging to the same project are active with different models.
Reproduction scenario
Open the same project.
Create/open two separate sessions.
Select a different model for each session.
Continue chatting in both sessions.
After some usage, observe that the model assigned to one of the sessions may unexpectedly change.
The issue seems intermittent, so it may not happen immediately on every attempt.
Additional notes
Since the same behavior occurs in both the CLI and Desktop application, it may be related to how session/model state is being stored or synchronized rather than being specific to either UI.
Plugins
None
OpenCode version
Desktop (2.0.22) & CLI (2.0.20)
Steps to reproduce
- Just
Screenshot and/or share link
Operating System
Windows
Terminal
Windows Terminal , Alacritty
Activity
github-actions commentedon Oct 2, 2026
This issue might be a duplicate of an existing issue. Please check:
opencodejr commentedon Oct 27, 2026
Thanks for the detailed report. I tried to reproduce this on 2.0.20 (on Linux, with a simulated provider that has two models) and couldn't. I tried three setups:
/modelsin both sessions.In every case each session kept its own model, both in the composer and on the replies.
The providers may be the missing piece: you're using a ChatGPT/Codex subscription and DeepSeek, which I couldn't test without real accounts. Several changes in this area have landed since 2.0.20/2.0.22, for example keeping a session's saved model when it is temporarily missing from the model list (#53822) and when the model list refreshes (#54481).
These details would help:
modelsetting, and whether the sessions use different agents.Related: #2131 is an older report of the same symptom, but it was against v1, which is a separate codebase.
opencodejr commentedon Oct 30, 2026
I'm closing this issue for now because we couldn't reproduce it and haven't heard back. On 2.0.20, with two sessions on different models in the same project, each session kept its own model. I tested two TUI windows and two tabs in one TUI.
If it still happens on the latest release, please reply here or open a new issue and link this one. These details would help us look into it again:
Thanks for the report!