LangSmith: AI Agent & LLM Observability and Evals Platform
LangSmith is the complete framework agnostic AI agent and LLM observability, evaluation, and deployment platform.
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<!DOCTYPE html><!-- Last Published: Fri Apr 17 2026 15:01:03 GMT+0000 (Coordinated Universal Time) --><html data-wf-domain="www.langchain.com" data-wf-page="699c04a661aeac7d92d8b2cb" data-wf-site="65b8cd72835ceeacd4449a53" data-wf-intellimize-customer-id="117666088" lang="en"><head><meta charset="utf-8"/><link href="https://cdn.prod.website-files.com" rel="preconnect" crossorigin="anonymous"/><title>LangSmith: AI Agent & LLM Observability and Evals Platform</title><meta content="LangSmith is the complete framework agnostic AI agent and LLM observability, evaluation, and deployment platform." name="description"/><meta content="LangSmith: AI Agent & LLM Observability and Evals Platform" property="og:title"/><meta content="LangSmith is the complete framework agnostic AI agent and LLM observability, evaluation, and deployment platform." property="og:description"/><meta content="https://cdn.prod.website-files.com/65b8cd72835ceeacd4449a53/69a1e940445f906819498b7a_Website%20preview-LangSmith%20Platform%20Page.png" property="og:image"/><meta content="LangSmith: AI Agent & LLM Observability and Evals Platform" property="twitter:title"/><meta content="LangSmith is the complete framework agnostic AI agent and LLM observability, evaluation, and deployment platform." property="twitter:description"/><meta property="og:type" content="website"/><meta content="summary_large_image" name="twitter:card"/><meta content="width=device-width, initial-scale=1" name="viewport"/><link href="https://cdn.prod.website-files.com/65b8cd72835ceeacd4449a53/css/langchain-tonik.shared.d95745d58.min.css" rel="stylesheet" type="text/css" integrity="sha384-2VdF1YE0VD4SudPNu1z5xNNfl8aF0B2esd2fih5uoQOZjR7nm8AIApzir2JTZT3Y" crossorigin="anonymous"/><style>html.w-mod-js:not(.w-mod-ix3) :is([text-paragraph-animation-start], [text-paragraph-animation]) {visibility: hidden !important;}</style><link href="https://fonts.googleapis.com" rel="preconnect"/><link href="https://fonts.gstatic.com" rel="prec