What LangChain does
LangChain is an agent-engineering platform that combines open-source frameworks (LangChain, LangGraph, and Deep Agents) with a commercial production platform (LangSmith) to help teams build, test, deploy, and continuously improve LLM agents. The company positions its stack around the full lifecycle of “agent engineering,” where reliability requires more than prompting—teams need orchestration, evaluation, monitoring, and governance across changing agent behavior.
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LangChain’s go-to-market centers on using its open-source libraries to attract builders, then monetizing via LangSmith for observability, evaluation, and enterprise deployment; additional products (such as LangSmith Fleet and LangSmith Engine) aim to make agent management and debugging more operational for teams moving from prototypes to multi-agent, long-running workflows. LangChain’s customers span startups and enterprises across industries, and LangChain states it works with a large share of Fortune 500 companies and processes very high volumes of agent telemetry in LangSmith.