  Interacting with human via high-quality multi-turn dialogues is a key feature
of large language models (LLMs). However, human-based evaluation of such
capability involves intensive manual labor. This report provides a preliminary
evaluation of existing large language models for human-style multi-turn
chatting, through an LLM-based approach. We start from real-world human
dialogues and keep the very first utterances as the ChatSEED. Then we prompt
LLMs to generate a full multi-turn dialogue (tens of utterances) based on the
ChatSEED, utterance by utterance. Finally, we adopt state-of-the-art LLMs
(GPT-4, \etc) as the judge to evaluate the generated dialogues. With different
evaluation protocols, we come to substantially identical conclusions. We find
that GPT-4 can generate human-style multi-turn dialogues with impressive
quality, significantly outperforms its counterparts. It's difficult for a
discriminator to distinguish between GPT-4 generated dialogues and human
dialogues. In contrast, other LLMs struggle to generate multi-turn dialogues of
satisfactory quality due to poor instruction-following capability, tendency to
generate lengthy utterances, or limited general capability. All data and codes
will be provided in https://github.com/open-compass/BotChat/ and we hope they
can serve as a valuable resource for evaluating multi-turn chatting
capabilities of LLMs.
