Yeah I had GPT5.6 Sol act as an editor on my new chapter and it did find decent issues with PoV and narrative distance but it was so bad at prose. The best way I can describe it is, it was too clean. Often times humans write about things unsaid and left for reader to interpret or deliberate awkward sentences to tease character psychology. The AI just straight up corrects these without second thought. This will likely be the case with general purpose models unless we see some genre specific fine tunes.