It's good at spotting stuff, like:
* Overusing verbs
* Poor structure
* Bad transitions between grafs
* Passive voice
And even bigger-picture stuff, like "you might want to zoom in here" or "this section isn't paying off". I've only in the past few months started using it for proofreading, and it's pretty solid.
But if you take any of its words, you're infecting your writing with Claude's tone, and it will show.
It's super useful as a reader of your writing. It's a terrible collaborator, unless you're writing for an audience of middle managers.
I’ve always had a sophisticated vocabulary, now people think my content is AI generated. Frown.
Vocabulary is only part of it. LLM style is pretty recognizable, and most people don’t normally write like that. One reason is because they’re trained in a lot of marketing material, news articles, and the like. If it sounds like a self-unaware middle manager writing on LinkedIn, but it isn’t one, it’s probably an LLM.