--- title: Regression Testing with LangSmith | daily.dev description: LangSmith's improved regression testing experience helps AI engineers evaluate and iterate on LLM applications with confidence. Unlike traditional software... canonical: https://daily.dev/posts/regression-testing-with-langsmith-prt9woech twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Regression Testing with LangSmith | daily.dev og:description: LangSmith's improved regression testing experience helps AI engineers evaluate and iterate on LLM applications with confidence. Unlike traditional software... og:url: https://daily.dev/posts/regression-testing-with-langsmith-prt9woech og:image: https://api.daily.dev/og/posts/Prt9WoeCH.png og:image:alt: Regression Testing with LangSmith og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Regression Testing with LangSmith **[LangChain](https://daily.dev/sources/langchain)** · 4 min read · 0 upvotes · 0 comments ## Summary LangSmith's improved regression testing experience helps AI engineers evaluate and iterate on LLM applications with confidence. Unlike traditional software testing where tests always pass, AI application testing requires tracking performance over time and comparing results across multiple runs. Key features include a Comparison View for selecting multiple experiments simultaneously, Display options for controlling what information is shown, and the ability to set a baseline run and automatically highlight datapoints that improved or regressed on evaluation metrics. Filtering and row expansion features allow engineers to quickly drill into the most interesting behavioral changes between runs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [How Similarweb Evaluates Agent Reports with LangSmith](https://daily.dev/posts/how-similarweb-evaluates-agent-reports-with-langsmith-brldcch8t) · LangChain · 1 upvotes · 0 comments - [Guide to Selecting the Best LLM Optimization Software for AI Teams](https://daily.dev/posts/guide-to-selecting-the-best-llm-optimization-software-for-ai-teams-snvfzvz9p) · PromptLayer Blog · 0 upvotes · 1 comments - [How to Test and Improve AI Applications with an Evaluation Flywheel](https://daily.dev/posts/how-to-test-and-improve-ai-applications-with-an-evaluation-flywheel-2yavius26) · freeCodeCamp · 6 upvotes · 0 comments - [Stop Calling It AI Testing—It’s Time for AI Validation Engineering](https://daily.dev/posts/stop-calling-it-ai-testing-it-s-time-for-ai-validation-engineering-0gukiqjrw) · SD Times · 1 upvotes · 0 comments --- Tags: [#testing](https://daily.dev/tags/testing), [#llm](https://daily.dev/tags/llm), [#langchain](https://daily.dev/tags/langchain), [#ai-engineering](https://daily.dev/tags/ai-engineering), [#langsmith](https://daily.dev/tags/langsmith) [View this post on daily.dev](https://daily.dev/posts/regression-testing-with-langsmith-prt9woech) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Regression Testing with LangSmith","url":"https://daily.dev/posts/regression-testing-with-langsmith-prt9woech","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/regression-testing-with-langsmith-prt9woech"},"datePublished":"2026-07-08T19:22:59.518Z","dateModified":"2026-07-08T19:24:42.683Z","description":"LangSmith's improved regression testing experience helps AI engineers evaluate and iterate on LLM applications with confidence. 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