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LangChain 1.4.0 released

2026-09-05

LangChain 1.4.0 released — Photo: the published report-orian (CC BY-SA 2.0)

Version 1.4.0 of the agent framework for tool-using LLM applications was released on September 3, 2026, with a 72-hour extension.

New capabilities include langchain.mcp, an MCPAdapter, runnable examples and destination-aware routing.

Limitations: remote MCP server trust is not established, and compatibility testing is needed.

It is open source, with no licence-fee announcement.

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