Top LLM Observability and Evaluation Platforms in 2026: Langfuse, LangSmith, Braintrust, Arize, and More Compared
LLM applications fail in ways traditional software does not. The same prompt can produce different outputs. A retrieval step can return the wrong document while every HTTP status reads 200. An agent can loop through fourteen tool calls, burn thousands of tokens, and deliver a confidently wrong answer. Standard application performance monitoring (APM) alone does […]

