Vicuna is an open-source chatbot that has been trained using user-shared conversations collected from ShareGPT. It has been fine-tuned on a LLaMA base model and has achieved impressive performance, with a quality on par with OpenAI ChatGPT and Google Bard. Vicuna outperforms other models like LLaMA and Stanford Alpaca in the majority of cases. The cost of training Vicuna is around $300, and the code and weights are publicly available for non-commercial use. An online demo is also available to interact with Vicuna and test its capabilities.