Portkey vs OpenLLMetry
Side-by-side from the Top 11 rankings of Vellum vs Humanloop vs PromptLayer: 11 Best Prompt Engineering & Prompt Management Tools 2026 and LangSmith vs Arize AI vs Datadog: 11 Best LLM Observability Platforms 2026 Ranked. Last verified May 31, 2026.
The short answer
Portkey ranks higher on Top 11 (#6 vs #11) for AI engineers managing and versioning production prompts / AI/ML engineers debugging production LLM apps. Combines a robust AI gateway with solid prompt management tools.
At a glance
| Portkey | OpenLLMetry | |
|---|---|---|
| Top 11 rank | #6 / Vellum vs Humanloop vs PromptLayer: 11 Best Prompt Engineering & Prompt Management Tools 2026 | #11 / LangSmith vs Arize AI vs Datadog: 11 Best LLM Observability Platforms 2026 Ranked |
| Score (out of 9.4) | 8.2 | — |
| Best for | AI gateway and prompt management | Open source, OpenTelemetry-native tracing |
| Pricing | $$ ($100 to $1,000+/mo) | $ (Free) |
| HQ | Bengaluru, India | Open Source |
| 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
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.