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Top LLM Observability & Evaluation in 2026
Tracing, latency monitoring, prompt playground evaluation, and guardrails for production LLM applications.
LangSmith
Top Pick
Freemium
The all-in-one developer platform for debugging, evaluating, and monitoring LLMs
Best For: AI engineers building production apps who need to debug why an agent hallucinated or failed a tool call.
Arize Phoenix
Open-Source
Open-source AI observability, tracing, and evaluation powered by OpenInference
Best For: Engineers and researchers prioritizing open-source, local privacy, and standardized telemetry.