That's the thing even the most barebones open-source wrappers had since 2022. Probably even before because ERP stuff people played with predates chatgpt by like two years (even if it was very simple).
Gemini btw too.
Though I'm not sure if they did not sneak it as some part of AB-test because the last time I did check was in october and I'm pretty sure it was not there.
Just edit a message and it’s a new branch.
This feature has spoiled me from using most other interfaces, because it is so wasteful from a context perspective to need to continually update upstream assumptions while the context window stretches farther away from the initial goal of the conversation.
I think a lot more could be done with this, too - some sort of 'auto-compact' feature in chat interfaces which is able to pull the important parts of the last n messages verbatim, without 'summarizing' (since often in a chat-based interface, the specific user voicing is important and lost when summarized).
I don't see them on their mobile app though.