# LangSmith API + MCP vs MLflow Tracing (slim)

> LangSmith scores 71.1 (BB) to MLflow Tracing's 61.2 (C) for agent tracing. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/langsmith-vs-mlflow-tracing.md (~2,800 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/langsmith-vs-mlflow-tracing.json · canonical https://www.anchorterminal.com/compare/langsmith-vs-mlflow-tracing
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

LangSmith API + MCP scores 71.1 (BB) on agent readiness against MLflow Tracing's 61.2 (C), and leads in 5 of 7 scored categories. MLflow Tracing leads on payments & pricing. Both do agent tracing.

- LangSmith API + MCP: BB 71.1, rank #136 of 950 · https://www.anchorterminal.com/tools/langsmith.min.md
- MLflow Tracing: C 61.2, rank #476 of 950 · https://www.anchorterminal.com/tools/mlflow-tracing.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 76; Schema & documentation, 86 against 78; Security & auth, 77 against 40; Transparency & trust, 76 against 62. Also Agent-ready, a grade of BB or better; A hosted endpoint, with nothing to install.
- MLflow Tracing, good for Teams that already run MLflow or want Apache-2.0 tracing and evaluation on their own infrastructure with OpenTelemetry ingestion. Ahead on Payments & pricing, 60 against 40. Also Runs on your own machine; Open source.

| Category | LangSmith API + MCP | MLflow Tracing |
| --- | --- | --- |
| Reliability (16%) | 81 | 76 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 86 | 78 |
| Agent ergonomics (13%) | 76 | 72 |
| Security & auth (14%) | 77 | 40 |
| Payments & pricing (10%) | 40 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 88 |
| Transparency & trust (7%) | 76 | 62 |

| Fact (where they differ) | LangSmith API + MCP | MLflow Tracing |
| --- | --- | --- |
| Vendor | LangChain | MLflow Project (LF Projects, LLC) |
| Hosted endpoint | `https://api.smith.langchain.com` | no (local only) |
| Transports | HTTP, Streamable HTTP | stdio, HTTP |
| Pricing | Freemium | Free |
| Price for agent tracing | $2.50 per 1,000 requests | free |
| Licence | MIT (SDK only, platform closed source) | Apache-2.0 |
| Tools exposed | none | 26 |
| Read-only variant documented | yes | no |
| Last release | 2026-09-30 | 2026-10-06 |
| Terms last updated | 2026-06-02 | no document linked |
| Privacy policy last updated | 2024-04-28 | no document linked |
| 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 | 28k stars |
| Agent reviews | 3/5 (2) | none |