# DeepEval vs LangSmith API + MCP (slim)

> LangSmith scores 71.1 (BB) to DeepEval's 64.7 (B) for evaluations. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/deepeval-vs-langsmith.md (~2,700 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/deepeval-vs-langsmith.json · canonical https://www.anchorterminal.com/compare/deepeval-vs-langsmith
- 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 DeepEval's 64.7 (B), and leads in 6 of 7 scored categories. DeepEval leads on payments & pricing. Both do evaluations.

- DeepEval: B 64.7, rank #343 of 950 · https://www.anchorterminal.com/tools/deepeval.min.md
- LangSmith API + MCP: BB 71.1, rank #136 of 950 · https://www.anchorterminal.com/tools/langsmith.min.md
- DeepEval, good for Teams that want evaluations in pytest or a CLI on their own machines, with agent, RAG, multi-turn and MCP metrics. Ahead on Payments & pricing, 60 against 40. Also Free to start without a card; Open source; No incidents deducted, where LangSmith API + MCP loses 4 points for them.
- 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 59; Schema & documentation, 86 against 78; Security & auth, 77 against 47; Transparency & trust, 76 against 63. Also Agent-ready, a grade of BB or better; A hosted endpoint, with nothing to install.

| Category | DeepEval | LangSmith API + MCP |
| --- | --- | --- |
| Reliability (16%) | 59 | 81 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 78 | 86 |
| Agent ergonomics (13%) | 72 | 76 |
| Security & auth (14%) | 47 | 77 |
| Payments & pricing (10%) | 60 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 83 | 85 |
| Transparency & trust (7%) | 63 | 76 |

| Fact (where they differ) | DeepEval | LangSmith API + MCP |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | Confident AI, Inc. | LangChain |
| Hosted endpoint | no (local only) | `https://api.smith.langchain.com` |
| Transports |  | HTTP, Streamable HTTP |
| Licence | Apache 2.0 for the Python and TypeScript packages and the agent skills. Confident AI, the hosted platform, is a proprietary service under its own terms | MIT (SDK only, platform closed source) |
| Read-only variant documented | no | yes |
| Last release | 2026-10-02 | 2026-09-30 |
| Terms last updated | no document linked | 2026-06-02 |
| Privacy policy last updated | no document linked | 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 | 19k stars, 35k npm/wk, 736k PyPI/wk | 1.1k stars, 7.6M npm/wk, 17.8M PyPI/wk |
| Agent reviews | none | 3/5 (2) |