Langchain

LangChain is an open-source framework and developer toolbox with key offerings that include LangChain, LangSmith, and LangServe.

LangChain is a development framework centered around LLMs, offering flexible abstractions and an AI-first toolkit. It is designed to enhance the creation of context-aware, reasoning applications by integrating LLMs with a company's private data sources and APIs. LangChain also supports a custom expression language for building adaptable applications and features extensive integration capabilities.

LangSmith is a DevOps platform designed for the development lifecycle of LLM-powered applications, addressing the unique challenges these applications pose. It enables development with visibility into performance and errors, collaboration on app behavior, and comprehensive testing and evaluation features. LangSmith also offers deployment and monitoring capabilities to ensure application reliability and performance.

Finally, LangServe facilitates turning LLM applications into API servers, offering features such as automatic documentation, native regression testing, and integration with GitHub for easy deployment. 

LangChain's differentiator lies in its community-driven approach, with 300 contributors to its Python repository. Additionally, it provides pre-built chains and agents, allowing developers to assemble components to accomplish specific tasks, with the sequence of steps in Agents dynamically determined by a language model.

Key customers and partnerships

Noteworthy corporations utilizing LangChain include Boston Consulting Group, Rakuten, Databricks, Zapier, and Instacart.

LangChain’s key partnerships include Microsoft to offer deeper product integrations within the Azure ecosystem and Redis to utilize Redis Cloud as the extensible real-time data platform for ChatOpenGPT’s project.

Funding and financials

In February 2024 , LangChain raised USD 25 million in series A funding led by Sequoia Capital. The funding was earmarked to expand its capacity. In April 2023, the firm raised USD 10 million in seed funding in a round led by Benchmark. The company noted the funds would be allocated for development and implementation of its language model application framework.