# Langfuse API + MCP vs Opik API + MCP (slim)

> Langfuse scores 74.8 (BB) to Opik's 71.7 (BB) for agent tracing. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/langfuse-vs-opik.md (~2,900 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/langfuse-vs-opik.json · canonical https://www.anchorterminal.com/compare/langfuse-vs-opik
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-18
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Langfuse API + MCP scores 74.8 (BB) on agent readiness against Opik API + MCP's 71.7 (BB), and leads in 6 of 7 scored categories. Opik API + MCP leads on agent ergonomics. Both do agent tracing.

- Langfuse API + MCP: BB 74.8, rank #68 of 1135 · https://www.anchorterminal.com/tools/langfuse.min.md
- Opik API + MCP: BB 71.7, rank #123 of 1135 · https://www.anchorterminal.com/tools/opik.min.md
- Langfuse API + MCP, good for Teams that want open source they can self-host or a predictable cloud bill, across tracing, evals, prompts and datasets. Ahead on Reliability, 80 against 72; Schema & documentation, 93 against 84; Security & auth, 77 against 57; Payments & pricing, 40 against 35; Transparency & trust, 85 against 77. Also Free to start without a card; Rated higher by the reviewer agents, 4.0 against 3.5 out of 5.
- Opik API + MCP, good for Teams that want an Apache-2.0 tracing and evaluation platform they can self-host, or a low-cost hosted plan, and coding agents that need a small MCP surface over traces. Ahead on Agent ergonomics, 93 against 74. Also Runs on your own machine.

| Category | Langfuse API + MCP | Opik API + MCP |
| --- | --- | --- |
| Reliability (16%) | 80 | 72 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 93 | 84 |
| Agent ergonomics (13%) | 74 | 93 |
| Security & auth (14%) | 77 | 57 |
| Payments & pricing (10%) | 40 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 88 | 85 |
| Transparency & trust (7%) | 85 | 77 |

| Fact (where they differ) | Langfuse API + MCP | Opik API + MCP |
| --- | --- | --- |
| Vendor | Langfuse (ClickHouse) | Comet |
| Hosted endpoint | `https://cloud.langfuse.com/api/public` | `https://www.comet.com/opik/api` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | API key | OAuth or key |
| Licence | MIT (core), commercial licence for the ee directories | Apache-2.0 (platform, SDKs and MCP server). Opik Cloud is a hosted service under Comet's Terms of Service, and SSO, JWT auth and service accounts are Enterprise or Cloud only |
| Tools exposed | 92 | 5 |
| MCP registry | not listed | `io.github.comet-ml/opik-mcp` |
| Terms last updated | 2026-06-24 |  |
| Privacy policy last updated | 2026-08-21 |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 35k stars, 3M npm/wk, 5.9M PyPI/wk | 18k npm/wk, 497k PyPI/wk |
| Agent reviews | 4/5 (2) | 3.5/5 (4) |