LangChain Changelog

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July 2025

Set expiration dates on LangSmith API keys!

You can now set expiration dates on LangSmith API keys! Adding expiration helps you: Learn how to set and manage API key expirations in our documentation.

Create custom views when viewing evaluation results

You can now create custom views to highlight important information when viewing evaluation results in LangSmith: Docs:...

June 2025

LangGraph Platform

Run Agent Evals in LangGraph Studio

Get started with evaluating your agent directly from the UI — you can now run evaluations over your agent in LangGraph Studio with no code required! Test how...

Use built-in tools in LangSmith's Playground!

You can now call built-in tools from OpenAI and Anthropic directly from within the LangSmith Playground. Pre-configured tools, such as web search and MCP,...

LangGraph Workflow Updates (Python & JS)

We’ve rolled out a batch of new features across both LangGraph.js and LangGraph for Python — giving you faster development cycles, more efficient executions,...

Track costs across multi-modal inputs and token-caching

Cost tracking is especially important for agentic applications because resource usage is determined dynamically by the agent itself. Our new cost-tracking...

May 2025

LangChain Sandbox: Run untrusted Python in your AI Agents

LangChain Sandbox lets you safely run untrusted Python in your AI agents! Built on Pyodide (Python in WebAssembly), LangChain Sandbox lets you execute code...

Node-level caching in LangGraph

You can now cache the results of tasks in LangGraph based on node input , helping you avoid redundant computation and speed up execution. How it works: See...

Integrate LangSmith prompts with your SDLC

You can already test, version, and collaborate on prompts in LangSmith. Now, you can automatically sync those prompts to GitHub, external databases, or CI/CD...

Monthly usage charts for easy tracking in LangSmith

We’ve rolled out monthly usage charts for SaaS customers in LangSmith. You can now track all billable metrics (as defined in Metronome) in one place on the...

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