AI Assistant Codex error "Failed to initialize ACP session. Error: Internal error"

Hello. Please collect logs and provide the upload ID in a support request so the engineers can assist you directly.
How to Collect logs
Create support request for the AI Assistant team

I had the same error: Failed to initialize ACP session. Error: Internal error: "no rollout found for thread id <thread number>"… Basically cannot continue developing in the thread. It happened after I upgraded PyCharm. Filed a support ticket, with upload ID

I reinstalled pycharm and fixed the error.

same issue here on pycharm when trying to use gpt 5.4 on a 5.3-codex session. I created a new session and everything is working

It occurred again today. Again, after I updated AI Assistant plug-in. But it hung even with a new chat. I had to uninstall Codex and reinstall it. Painful

I have the same issue

Have the same issue

Hi there,

Please submit a request via YouTrack to tell us about the issue in detail:
https://youtrack.jetbrains.com/issues/LLM

Or contact the support team at https://jb.gg/ai-assistant-support so we can assist you directly.