On this page: What the retrieval half of langchain-core is Index Pinned version: langchain-core==1.6.2 (released 2026-09-04) — the same package as the langchain-core reference ; that page covers the chat and tool types, this one covers the retrieval types. Two extras are needed for the examples: numpy (resolved to …

On this page: What langchain-text-splitters is Index Pinned version: langchain-text-splitters==1.1.2 (released 2026-04-16; it is the version pip resolves beside langchain-core==1.6.2, and its only requirement is langchain-core<2.0.0,>=1.2.31). Everything below was derived by inspecting this exact installed …

Five pages covering the pieces you actually touch in the LangChain 1.x stack: one per package for building an agent, and two for retrieval. Every entry says what the class or function defines or does, links to the official API page (opens in a new tab), and ends with a runnable example whose printed output was verified …

On this page: What langchain is in 1.x Index Pinned versions: langchain==1.4.0 (released 2026-09-03), which resolved langchain-core==1.6.2, langgraph==1.2.11 and (for the one live example) langchain-anthropic==1.7.1. Everything below was derived by inspecting these exact installed packages, and every offline example …

On this page: What langchain-core is Index Pinned version: langchain-core==1.6.2 (released 2026-09-04). Everything below was derived by inspecting this exact installed package, and every example was executed against it on Python 3.13. Each heading links to reference.langchain.com, which is unversioned and always serves …

On this page: What langgraph is Index Pinned version: langgraph==1.2.11 (released 2026-08-11; it pulls in langgraph-checkpoint 4.2.0, langgraph-prebuilt 1.1.0 and langgraph-sdk 0.4.4; the SqliteSaver example also needs langgraph-checkpoint-sqlite==3.1.1). Everything below was derived by inspecting this exact installed …