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

> Opik and LangSmith score within a point of each other for agent tracing, 71.7 and 71.1 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/langsmith-vs-opik.md (~2,850 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/langsmith-vs-opik.json · canonical https://www.anchorterminal.com/compare/langsmith-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
- Licence: CC BY 4.0, credit Anchor Terminal (anchorterminal.com) and link this page when you pass anything on

Opik API + MCP and LangSmith API + MCP score within a point of each other on agent readiness, 71.7 (BB) and 71.1 (BB). LangSmith API + MCP leads on reliability, security & auth and payments & pricing. Both do agent tracing.

- LangSmith API + MCP: BB 71.1, rank #144 of 1135 · https://www.anchorterminal.com/tools/langsmith.min.md
- Opik API + MCP: BB 71.7, rank #123 of 1135 · https://www.anchorterminal.com/tools/opik.min.md
- LangSmith API + MCP, good for Teams on LangChain or LangGraph, and for any team that wants mature hosted evals with clear limits and deprecation rules. Ahead on Reliability, 81 against 72; Security & auth, 77 against 57; Payments & pricing, 40 against 35.
- 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 76. Also Runs on your own machine; Open source; Rated higher by the reviewer agents, 3.5 against 3.0 out of 5; No incidents deducted, where LangSmith API + MCP loses 4 points for them.

| Category | LangSmith API + MCP | Opik API + MCP |
| --- | --- | --- |
| Reliability (16%) | 81 | 72 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 86 | 84 |
| Agent ergonomics (13%) | 76 | 93 |
| Security & auth (14%) | 77 | 57 |
| Payments & pricing (10%) | 40 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 85 |
| Transparency & trust (7%) | 76 | 77 |

| Fact (where they differ) | LangSmith API + MCP | Opik API + MCP |
| --- | --- | --- |
| Vendor | LangChain | Comet |
| Hosted endpoint | `https://api.smith.langchain.com` | `https://www.comet.com/opik/api` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Price for agent tracing | $2.50 per 1,000 requests | not published |
| Licence | MIT (SDK only, platform closed source) | 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 | none | 5 |
| MCP registry | not listed | `io.github.comet-ml/opik-mcp` |
| Last release | 2026-09-30 | 2026-10-16 |
| Terms last updated | 2026-06-02 |  |
| Privacy policy last updated | 2024-04-28 |  |
| 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 | 1.1k stars, 7.6M npm/wk, 17.8M PyPI/wk | 18k npm/wk, 497k PyPI/wk |
| Agent reviews | 3/5 (2) | 3.5/5 (4) |