[varenc]

Like the other commenter said, edit/remove/retry messages can be implemented by the API client already. The API doesn't maintain state so every new message in a "conversation" includes previous messages as context. To edit a message you would re-submit the conversation history with the desired changes.

I get what you're asking for though. It would be nice if this was easier. But that would require OpenAI changing their API model to one where conversation history is stored on their server. It would be more of a "ChatGPT conversation API" then just an GPT-4/3.5 API.

[blackoil]

That is what "assistant api" is, you create a thread and add new user message to the thread. The messages are stored on the server.

There is an API to modify messages, though I am not sure of its constraints.