compare
Arize Phoenix vs OpenLIT
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Arize Phoenix | OpenLIT |
|---|---|---|
| Language | Python | TypeScript |
| Licence | Other | Apache-2.0 |
| Stars | 12k | 2.8k |
| Latest | arize-phoenix-v20.19.0 | openlit-2.1.0 |
| Last push | 2026-10-06 | 2026-10-05 |
| Release cadence | about 1 day between releases | about 8 days between releases |
| Active contributors | 55+ commit authors on the default branch in the last 90 days | 46 commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace LangSmith. Alternatives to LangSmith →
Full replacementArize PhoenixTracing over OpenTelemetry, datasets, experiments and evaluations.
PartialOpenLITOpenTelemetry-native traces and metrics for LLM apps, GPUs and vector databases, with prompt management.
Arize Phoenix
- arize-phoenix-v20.19.02026-10-01arize-phoenix: v20.19.0
- @arizeai/phoenix-mcp@4.3.152026-09-30Updated dependencies [f8ae2fc]
- @arizeai/phoenix-cli@1.18.72026-09-30Updated dependencies [f8ae2fc]
- @arizeai/phoenix-client@7.16.02026-09-30f8ae2fc: Add listProjectAnnotationConfigs, assignProjectAnnotationConfig, unassignProjectAnnotationConfig, and setProje…
- arize-phoenix-v20.18.02026-09-30arize-phoenix: v20.18.0
OpenLIT
- openlit-2.1.02026-09-10openlit: 2.1.0
- openlit-2.0.02026-08-28openlit: 2.0.0
- otel-gpu-collector-0.0.82026-08-26otel-gpu-collector: 0.0.8
- ts-1.15.02026-08-03Add per-evaluation-type threshold scores and API-key-authenticated create/update endpoints for offline evaluation types…
- py-1.45.02026-08-03Aligned offline/SDK evaluations with tenant-configured evaluation types including rule-engine context resolution and pe…
Arize Phoenix
✓ signed The latest release, arize-phoenix-v20.19.0, carries a signature GitHub verified.
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OpenLIT
unsigned The latest release, openlit-2.1.0, carries no signature GitHub could verify.
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