Codex loses track of session model/effort
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app
bug
session
- Dominant language
- Rust
- Stars
- 125k
- Forks
- 19.4k
- PR merge metrics
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Description
What version of the Codex App are you using (From “About Codex” dialog)?
v0.154.0
What subscription do you have?
Pro
What platform is your computer?
No response
What issue are you seeing?
When backtracking to a previous message, model can change if in another Codex session I've used a different model.
What steps can reproduce the bug?
- Start Session 1 and set it to Astra medium. Send a few messages (so you can backtrack later)
- In another terminal, start Session 2 and set the model to Sol high
- Go back to Session 1 and backtrack to an older message
Now Session 1 is using Sol high instead of Astra medium.
What is the expected behavior?
Backtracking must not change model and effort. In the example above, Session 1 should have continued to use Astra medium.
Additional information
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue with two Codex sessions, using different models and effort levels, then trace the backtracking and session-state handling. Done means returning to an older message in Session 1 preserves its original model and effort instead of adopting Session 2's settings.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- cli
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Active
- Clarity
- Clearly specified
- Newbie friendliness
- 68/100