compare
Arize Phoenix vs Opik
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Arize Phoenix | Opik |
|---|---|---|
| Language | Python | Python |
| Licence | Other | Apache-2.0 |
| Stars | 12k | 22k |
| Latest | arize-phoenix-v20.19.0 | 2.2.92 |
| Last push | 2026-10-06 | 2026-10-06 |
| Release cadence | about 1 day between releases | about 1 day between releases |
| Active contributors | 55+ commit authors on the default branch in the last 90 days | 50+ 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.
Full replacementOpikTracing, datasets, experiments and LLM-as-a-judge evaluations.
Both replace W&B Weave. Alternatives to W&B Weave →
Full replacementArize PhoenixTracing and evaluations of LLM calls, built on OpenInference instrumentation.
Full replacementOpikTracing and evaluations of LLM calls, with production monitoring dashboards.
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
Opik
- 2.2.922026-10-06[OPIK-8566] [BE] feat: free-form SQL post-run check, behind off/audit/enforce
- 2.2.912026-10-06[OPIK-8515] [SDK] fix: explicit update_current_span/trace output wins over @track's captured return value
- 2.2.902026-10-05[OPIK-8575] [FE] feat: offer max reasoning effort on OpenAI keys set to the Responses API
- 2.2.892026-10-05[NA] [HELM] [DOCS] fix: bump clickhouse-backup to 2.7.4 for object-disk backups
- 2.2.882026-10-02[OPIK-7965] [FE] feat: render compare prompts as messages and store prompt templates
Arize Phoenix
✓ signed The latest release, arize-phoenix-v20.19.0, carries a signature GitHub verified.
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Opik
✓ signed The latest release, 2.2.92, carries a signature GitHub verified.
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