OpenChatKit is an open-source project that provides a powerful foundation for creating specialized and general-purpose chatbots for various applications. It includes a large language model fine-tuned with instruction tuning, customizable fine-tuning templates, an extensible retrieval system, and content filtering models. OpenChatKit can handle various natural language tasks such as dialogue, question answering, classification, extraction, and summarization. It is trained on the OIG-43M dataset created by Together, LAION, and Ontocord.