compare
Langfuse vs Opik
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Langfuse | Opik |
|---|---|---|
| Language | TypeScript | Python |
| Licence | Other | Apache-2.0 |
| Stars | 35k | 22k |
| Latest | v4.53.0 | 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 | 33+ 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 replacementLangfuseTracing, prompt management, datasets and evaluations, with OpenTelemetry ingestion.
Full replacementOpikTracing, datasets, experiments and LLM-as-a-judge evaluations.
Both replace W&B Weave. Alternatives to W&B Weave →
Full replacementLangfuseTracing and evaluations of LLM calls, with SDKs for Python and JavaScript.
Full replacementOpikTracing and evaluations of LLM calls, with production monitoring dashboards.
Langfuse
- v4.53.02026-10-06feat(ai-gateway): expose resolution context in response headers, spans and logs
- v4.52.02026-10-06feat(trace-batch): bound batches by estimated weight and exclude oversized traces
- v4.51.02026-10-05feat(mcp): support decision-model evaluators
- v4.50.02026-10-02feat(web): show error id in tRPC error toast and include it in issue reports
- v4.49.02026-10-01feat(web): add org-level ingestion overview tRPC route
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
Langfuse
unsigned The latest release, v4.53.0, carries no signature GitHub could verify.
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Opik
✓ signed The latest release, 2.2.92, carries a signature GitHub verified.
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