[Windows] All Codex chats and projects appear in ChatGPT view after switching, despite documented separation

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

26.818.8289.0

What subscription do you have?

Plus

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

Summary

After switching from Codex to ChatGPT (Chat/Work) inside the unified Desktop app, all Codex chats and projects become visible in the ChatGPT view. This contradicts OpenAI's own documentation, which states Codex history is kept separate from ChatGPT history.

Evidence

This was straightforward to confirm unambiguously: I currently have only a small number of chats/projects in Codex, so there was no risk of mistaking pre-existing ChatGPT items for leaked Codex ones. Immediately after switching views, the same small set of Codex chats/projects appeared listed under ChatGPT.

Impact

Breaks the documented separation between Codex (development work) and ChatGPT (general use) — same category of privacy/context-boundary concern raised in #32494 for the reverse direction (ChatGPT history appearing in Codex).

What steps can reproduce the bug?

1. Open the Desktop app, select Codex from the top-left menu.
2. Confirm Codex has its own chats/projects listed (a small number, in my case, made this easy to verify unambiguously — no risk of confusing them with pre-existing ChatGPT items).
3. Switch to ChatGPT (Chat/Work) from the same top-left menu.
4. Observe: all Codex chats and projects are now visible in the ChatGPT view as well.

What is the expected behavior?

Per OpenAI's own Help Center documentation ("ChatGPT Work and Codex"): "Codex remains a separate view. Its workflows are unchanged, and its history remains separate from ChatGPT history." Codex chats and projects should not appear in the ChatGPT (Chat/Work) view after switching.

Additional information

Related but not identical reports on the same Chat/Work/Codex separation boundary — flagging in case this is a symptom of the same underlying sync/attribution mechanism, though the direction and trigger differ:

• #32494 — opposite direction: personal ChatGPT history appearing inside Codex.
• #33087 — general feature request for separating histories, no specific reproduction steps.
• #33910 — Codex CLI sessions misattributed to ChatGPT/Work, a different trigger (CLI session creation) than plain UI switching.

This report is specifically about: switching views inside the Desktop app surfaces existing Codex chats/projects inside ChatGPT, with no CLI or external trigger involved.