OpenLLMetry vs LangSmith
Side-by-side from the Top 11 ranking of LangSmith vs Arize AI vs Datadog: 11 Best LLM Observability Platforms 2026 Ranked. Last verified May 31, 2026.
The short answer
LangSmith ranks higher on Top 11 (#1 vs #11) for AI/ML engineers debugging production LLM apps. The essential, purpose-built observability tool for the massive LangChain ecosystem, offering unmatched debugging depth.
At a glance
| OpenLLMetry | LangSmith | |
|---|---|---|
| Top 11 rank | #11 / LangSmith vs Arize AI vs Datadog: 11 Best LLM Observability Platforms 2026 Ranked | #1 / LangSmith vs Arize AI vs Datadog: 11 Best LLM Observability Platforms 2026 Ranked |
| Score (out of 9.4) | 7.1 | 9.2 |
| Best for | Open source, OpenTelemetry-native tracing | Deep debugging for LangChain apps |
| Pricing | $ (Free) | $$ ($75 to $500/mo) |
| HQ | Open Source | San Francisco, USA |
| Founded | 2023 | 2023 |
OpenLLMetry
A vendor-agnostic, open-source standard for adding LLM signals to OpenTelemetry traces.
github.com/traceloop/openllmetrySee full entry in LangSmith vs Arize AI vs Datadog: 11 Best LLM Observability Platforms 2026 Ranked
LangSmith
The essential, purpose-built observability tool for the massive LangChain ecosystem, offering unmatched debugging depth.
www.langchain.com/langsmithSee full entry in LangSmith vs Arize AI vs Datadog: 11 Best LLM Observability Platforms 2026 Ranked
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.