LangChain Changelog

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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...

View agent deployment metrics in LangSmith

You can now monitor your agent deployments directly from the LangSmith UI. View your deployment’s CPU & memory usage, API request latency, pending/active run...

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

Run Agent Evals in LangSmith Studio

Get started with evaluating your agent directly from the UI — you can now run evaluations over your agent in LangSmith 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,...

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...

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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