  Large Language Models (LLMs) have demonstrated surprising performance on many
tasks, including writing supportive messages that display empathy. Here, we had
these models generate empathic messages in response to posts describing common
life experiences, such as workplace situations, parenting, relationships, and
other anxiety- and anger-eliciting situations. Across two studies (N=192, 202),
we showed human raters a variety of responses written by several models (GPT4
Turbo, Llama2, and Mistral), and had people rate these responses on how
empathic they seemed to be. We found that LLM-generated responses were
consistently rated as more empathic than human-written responses. Linguistic
analyses also show that these models write in distinct, predictable ``styles",
in terms of their use of punctuation, emojis, and certain words. These results
highlight the potential of using LLMs to enhance human peer support in contexts
where empathy is important.
