LangSmith vs LLMEval

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

	LangSmith Evaluation	LLMEval Evaluation
Tagline	LangChain's eval + observability platform.	Open academic benchmark suite for stress-testing LLMs on contamination-resistant, domain-specific tasks.
Category	Evaluation	Evaluation
Pricing	Freemium· Developer: $0 · Plus: $39 · Enterprise: Custom pricing	Free· Free; open-source academic benchmarks
Model	Platform (any LLM)	Multi-model
Editorial score	8.7 / 10	7.2 / 10
Use cases	LLM tracingevalsLangChain integration	llm-benchmarkingacademic-evaluationmedical-ai-evalreasoning-benchmarkscontamination-resistant-testing
Pros	Tight LangChain integration Strong tracing UX Mature dataset/eval flows Reasonable per-seat pricing	Contamination-resistant methodology against benchmark leakage Covers 59 LLMs across 13 academic disciplines Published, peer-reviewed at AAAI/EMNLP/ACL Specialized tracks for medical and logical reasoning Fully open source — datasets and code on GitHub/HuggingFace
Cons	Best value if you're on LangChain UI can feel dense	No hosted dashboard or managed eval service Logic benchmark is Chinese-language focused Requires engineering effort to run locally Not a turn-key LLM-judge platform
Website	www.langchain.com	llmeval.com

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