Fiddler AI vs OpenLLMetry
Side-by-side from the Top 11 rankings of The 11 Best LLM Evaluation Platforms (2026) and 11 Best LLM Monitoring & AI Observability Platforms 2026 — LangSmith Alternatives Ranked. Last verified May 31, 2026.
The short answer
Fiddler AI ranks higher on Top 11 (#7 vs #11) for ML engineers and AI product teams measuring model quality / AI/ML engineers debugging production LLM apps. A mature, comprehensive platform for managing both LLM and classical ML models in the enterprise.
At a glance
| Fiddler AI | OpenLLMetry | |
|---|---|---|
| Top 11 rank | #7 / The 11 Best LLM Evaluation Platforms (2026) | #11 / 11 Best LLM Monitoring & AI Observability Platforms 2026 — LangSmith Alternatives Ranked |
| Score (out of 9.4) | 8 | 7.1 |
| Best for | Enterprise model management | Open source, OpenTelemetry-native tracing |
| Pricing | $$$$ (Custom Enterprise Pricing) | $ (Free) |
| HQ | Palo Alto, USA | Open Source |
| Founded | 2018 | 2023 |
Fiddler AI
A mature, comprehensive platform for managing both LLM and classical ML models in the enterprise.
www.fiddler.ai/See full entry in The 11 Best LLM Evaluation Platforms (2026)
OpenLLMetry
A vendor-agnostic, open-source standard for adding LLM signals to OpenTelemetry traces.
github.com/traceloop/openllmetryMethodology and scoring weights live at /methodology. No vendor pays for placement — see about.