Fork conversation from a message in transcript without affecting thread

[Falven]

What variant of Codex are you using?

CLI

What feature would you like to see?

I would like to be able to scroll through the transcript and similarly to how you can edit a message (e), choose to fork a new conversation from the selected message (f), without mutating the current thread.

Additional information

No response

[github-actions]

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

• [Feature] Support for Tree-based Conversation Management (Chat Tree / Branch) #12450
• Create branch from chat so we can work multiple things in parallel with shared context. #11702
• /fork should accept a new chat name argument for easy navigation #11595

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[etraut-openai]

Have you tried the /fork slash command? Does that meet your nees?

[Falven]

Hi @etraut-openai, yes, I tried the /fork slash command.

It does fork from a specific message, but it also effectively truncates the remainder of the original conversation (everything after the fork point is no longer part of that thread).

What I’m looking for is the same “fork from here” behavior, but triggered from a point in the transcript (e.g., via Ctrl+T) without modifying or truncating the original conversation.

Example

Original conversation:

• Message 1
• Message 2
• Message 3
• Message 4

If I want to fork from Message 2:

Desired behavior:

Original conversation (unchanged):

• Message 1
• Message 2
• Message 3
• Message 4

Forked conversation (new thread):

• Message 1
• Message 2

In other words: create a new branch starting at a chosen transcript point, while keeping the source thread intact.

[Falven]

Found an old upvoted comment also asking for the same here.