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LangChain Changelog

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December 2025

Pairwise annotation queues for comparing agent outputs

Pairwise Annotation Queues in LangSmith are a fast, structured way to compare two agent outputs side-by-side and pick a winner. Scoring subjective tasks is...

December 17, 2025

LangSmith Fetch: Debug agents from your terminal

We've launched LangSmith Fetch — a CLI tool that brings full LangSmith trace access directly into your terminal, coding environment, or IDE. If you build...

December 10, 2025

LangSmith Polly, our AI assistant for debugging, analyzing, and improving agents, is now in beta

We've launched Polly — an AI-powered assistant inside LangSmith that helps you debug, analyze, and improve your agents. Polly, now in beta, understands agent...

December 10, 2025

LangChain MCP Adapters 0.2.0

LangChain MCP Adapters 0.2.0 is live. This release brings quality-of-life upgrades for anyone building with MCP tools in LangChain: Multimodal tool support...

December 9, 2025

Unified cost tracking for LLMs, tools, retrieval

We’ve added full-stack cost tracking to LangSmith to make it easier to understand and monitor spend across complex agent applications. LangSmith now...

December 2, 2025

LangChain 1.1

LangChain v1.1.0 is now available This release makes agent development more reliable, more structured, and more context-aware — powered by a new...

December 2, 2025

November 2025

Sandboxes for Deep Agents

We’ve added full support for executing DeepAgent code inside remote sandboxes — providing safe, isolated, reproducible environments for complex agent...

November 30, 2025

Okta SCIM + SSO Integration

LangSmith is now live on the Okta Integration Network (OIN). Enterprise teams that use Okta can now: This makes it much simpler to centralize access...

November 17, 2025

October 2025

No Code Agent Builder in LangSmith, now in private preview

We're expanding who can build agents beyond developers with LangSmith Agent Builder— a no-code agent-building experience now in private preview. Build real...

October 29, 2025

`deepagents` 0.2 release for more autonomous agents

deepagents is our agent harness for building autonomous, long-running agents that tackle complex, open-ended tasks over extended time horizons. Our 0.2...

October 28, 2025

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