The combination of LangChain and Milvus can enhance ChatGPT's intelligence and efficiency by harnessing vector stores' power. LangChain is a framework for developing applications powered by language models, while Milvus is a vector database that enables semantic search functionality. By integrating these tools, developers can create more reliable AI-Generated Content (AIGC) applications and address hallucination problems in ChatGPT. Additionally, using GPTCache and fine-tuning embedding models and prompts can improve the performance and search quality of AIGC applications.