LLMs prefer their own writing on resumes to that of humans or other LLMs.
"The bias against human-written resumes is particularly substantial, with self-preference bias ranging from 67% to 82% across major commercial and open-source models."
https://arxiv.org/abs/2509.00462
Summary here
https://x.com/heynavtoor/status/2048088874686300431
QuoteSame person. Same resume. Same skills.
One version written by a human. One rewritten by GPT-4o.
GPT-4o picked its own version 97.6% of the time.
This matters a lot since more and more firms do an initial filter with AI. So if you know which model their HR department uses, you have a massive leg up.