Codex App repeatedly crashes on Windows with error code 3221225786

What version of the Codex App are you using (From “About Codex” dialog)?

26.707.71524

What subscription do you have?

ChatGPT Plus

What platform is your computer?

Windows 11, 64-bit (x64)

What issue are you seeing?

Codex repeatedly crashes on Windows in both the desktop app and the VS Code integration. The crash occurs a few seconds after submitting a command, including in newly created conversations.

The application repeatedly shows error code 3221225786, signal=null.

Recent error messages include:

• Model personality requested but model_messages is missing, falling back to base instructions.
• Failed to read canonical session metadata.
• Rollout JSONL is empty.
• State DB update_thread_metadata failed.

The issue persists after restarting, resetting, and reinstalling the application, creating new conversations, changing the personality setting, and lowering the reasoning effort. It occurs with different commands and is not limited to one project.

Codex is currently unusable because almost every submitted task causes the application to crash.

What steps can reproduce the bug?

1. Open the Codex desktop app on Windows 11.
2. Open any existing project or create a new conversation.
3. Enter any command and submit it.
4. Wait a few seconds.
5. The application crashes and displays error code 3221225786.

The problem also occurs in the VS Code Codex integration. It persists after restarting, resetting, and reinstalling the app, creating new conversations, changing the personality setting, and lowering the reasoning effort.

What is the expected behavior?

Codex should process the submitted command normally without crashing. The conversation and session metadata should be saved correctly, and the application should remain usable.

Additional information

The crash has occurred repeatedly with different internal warning messages, including:

• Model personality requested but model_messages is missing
• failed to read canonical session metadata
• rollout JSONL is empty
• state DB update_thread_metadata failed

App version: 26.707.71524
Model: GPT-5.6 Sol
Windows 11, 64-bit
Subscription: ChatGPT Plus

The same problem occurs in both the Codex desktop app and the VS Code integration. Screenshots of the errors are attached.

Please let me know which diagnostic logs or session files I should provide for further investigation.

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/9a3aab49-2e9f-4c16-9751-a47f2fbb2362" />
<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/e6211d43-d8d0-4025-81a9-7d566321274c" />
<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/a34f3556-ae9b-4ad6-b502-afab5463abcd" />
<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/a6d355d6-0f20-4c59-a565-8f9ed2d06c4c" />