LangSmith

What is LangSmith?

LangSmith is a developer platform specifically engineered for building applications powered by large language models (LLMs). It addresses the unique challenges of LLM development, such as prompt engineering, output evaluation, and performance monitoring. The platform provides a suite of tools that cover the entire lifecycle from prototyping to production. Developers can log and trace every interaction with the language model, allowing them to inspect inputs, outputs, and metadata in real-time. This traceability is crucial for debugging and optimizing complex chains of prompts and calls. LangSmith also offers evaluation tools that enable systematic testing of prompts and models against ground truth datasets, ensuring that application behavior meets requirements. Teams can collaborate by sharing traces and evaluations, and they can set up continuous integration pipelines that run evaluations automatically. The platform supports popular LLM providers and frameworks like LangChain, OpenAI, and Anthropic. With its intuitive dashboard, users can visualize latency, token usage, and error rates. LangSmith's pricing model is usage-based, starting at $0.50 per unit, which includes logging and evaluation credits. This makes it suitable for startups and enterprises alike. By providing end-to-end observability, LangSmith helps developers build more reliable and effective LLM applications.

Use Cases