Verified75% confidenceFactExact time
LangChain使用结构化的消息类型（SystemMessage、HumanMessage、AIMessage）组织对话，其设计与OpenAI Chat Completions API的messages数组格式高度对齐
5
Sources
75%
Confidence
Medium-term (~90 days)
Relevance
7/3/2026
First Seen
Valid until: 10/1/2026
Sources
LangChain入门：Model与Agent核心概念详解
bilibiliAgentic_RAG7/2/2026
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