LangChain Changelog

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February 2026

Customize trace previews in LangSmith

You can now configure which parts of a trace’s inputs and outputs appear directly in the tracing table. This is especially useful for projects with custom...

February 6, 2026

January 2026

LangSmith Self-Hosted

LangSmith Self-Hosted v0.13

This self-hosted release expands feature parity with LangSmith Cloud while improving performance, security, and operational control. It brings Insights , the...

January 16, 2026

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

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