Demanding sources for this is odd. It's literally been a headline feature of every frontier model for two years.
I guess you are "technically correct" that no model can "un-emit" tokens... but I don't think that is what anyone was saying or an interesting point to make.
Edit: see also this recent post, which details another place where revisions can happen, upstream of the reasoning token emission:
GP was saying
> That would be true of non-iterative models that just emit an output from beginning to end.
Which suggests that there are
- "iterative" models
which
- do not output "from beginning to end"
which AFAIK is science-fiction.
Since the LLM is now designed to run in a harness, it’s really not even wrong any more.