LangChain Changelog

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February 2025

useStream for integrating LangGraph for your React app

You can now integrate LangGraph into your React application with a single hook. Thread and state management, messages streaming and branching built-in. See...

February 21, 2025

Saved workspace secrets in LangSmith Playground

You can now use secrets saved in your workspace in the LangSmith Playground. Teams can use the same centralized keys used for evaluators to also experiment...

February 20, 2025

LangMem SDK for long-term agent memory

The LangMem SDK is a lightweight Python library that helps your agents learn and improve through long-term memory. It provides tooling to extract information...

February 20, 2025

LangSmith LangGraph

LangSmith Playground integration with LangGraph Studio

You can now open LLM runs from LangGraph Studio in the LangSmith Playground, making it easier to debug, visualize, and refine your agents. This is an early...

February 8, 2025

📊 New LangSmith experiment view for result analysis

The new LangSmith experiment view is now live, which makes it easier to explore your results. Use the experiment view to analyze the results and draw...

February 4, 2025

January 2025

Waterfall graphs to spot latency bottlenecks in LangSmith

You can now visualize traces as a waterfall graph for deeper insights into your app’s latency in LangSmith. Use the waterfall graph to: Try it out today:...

January 30, 2025

Functional API for LangGraph

LangGraph’s powerful state management— including short- & long-term memory, human-in-the-loop, and time travel — just got even more flexible. With the new...

January 29, 2025

Pytest and Vitest integrations for evaluations in LangSmith

Evaluations (evals) are crucial for building reliable, high-quality LLM applications. They ensure consistent performance, much like tests in software...

January 22, 2025

LangSmith Self-Hosted

LangSmith Self-Hosted v0.9

This release contains important changes for license key verification and sending subscription metrics and operational metadata to LangChain, beta support for...

January 21, 2025

New LangSmith Playground features to streamline workflow

The LangSmith Playground has several new updates, including: New Prompt Settings UI All your prompt settings are now organized in one streamlined view. You...

January 20, 2025

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