Anecdotally: I tried hook and crook to get the best flagship model at the time (Opus) to help with technical writing for a submission.

First, these models are not good at technical writing at all. They have no sense of the weight of a single sentence, they just love to blather.

Second, they can't keep the core technical story consistent throughout their completions. In other words, they can't "keep the main thing the main thing".

I had an early draft with AI writing, but by the time we submitted our work -- there was not a single piece of AI writing in the paper. And not without trying, I really did some iterations on trying to carefully craft context, give them a sense of the world model in which they needed to evaluate their additions, yada yada.

For clear and concise technical communication, it's a waste of time right now.