LangChain Changelog

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October 2025

JavaScript Code Evals for faster eval workflows

JavaScript Code Evals allow you to write custom Code Evals in JavaScript in addition to Python. This gives you the flexibility to choose the language that...

October 7, 2025

September 2025

Composite Evaluators in LangSmith

If you’re running multiple evaluators to measure different aspects of your application, it can be difficult to see the overall picture. Composite Evaluators...

September 23, 2025

Create org-scoped API keys with granular permissions

You can now create org-scoped service keys and optionally, assign roles for created keys. These updates give you more control, allowing you to: Learn more...

September 10, 2025

July 2025

Introducing Align Evals: Streamlining LLM Application Evaluation

Evaluations are a key technique for improving your application — whether you’re working on a single prompt or a complex agent. Iterating on evaluators has...

Keep external systems in sync with scheduled exports

You can now schedule automatic exports of your LangSmith traces, without needing to set up your own infrastructure. Whether you're syncing to a data...

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

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,...

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

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...

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