Open-source LLM observability platform for tracing, evaluating, and debugging AI applications
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Langfuse is the open-source observability platform for LLM applications. Trace every API call, evaluate output quality, monitor costs, and debug production issues. Integrates with LangChain, LlamaIndex, OpenAI SDK, and Vercel AI SDK. Used by thousands of AI teams to ship reliable LLM-powered products.