AI summary: First model to beat ChatGPT. OpenChat, a series of open-source language models, has been released, boasting a high performance with limited data. The models, which include OpenChat, OpenChat-8192, and OpenCoderPlus, have been fine-tuned on a diverse dataset of multi-round conversations. They have achieved top rankings in open-source models, surpassing the performance of ChatGPT in Vicuna GPT-4 evaluations. The models can be installed via CUDA and PyTorch, and full weights are provided as huggingface repos. The OpenChat series demonstrates the potential of achieving high performance with limited data in language models.