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

> LangSmith API + MCP has a score of 71.3 (BB) against Braintrust API + MCP's 61.3 (C). Both do obs traces. The largest gap is reliability, 20 points. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/braintrust-vs-langsmith.md (~1,750 tokens) · this version ~330 tokens · JSON https://www.anchorterminal.com/compare/braintrust-vs-langsmith.json · canonical https://www.anchorterminal.com/compare/braintrust-vs-langsmith
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

LangSmith API + MCP has a score of 71.3 (BB) against Braintrust API + MCP's 61.3 (C). Both do obs traces. The largest gap is reliability, 20 points.

- Braintrust API + MCP: C 61.3, rank #229 of 452 · https://www.anchorterminal.com/tools/braintrust.min.md
- LangSmith API + MCP: BB 71.3, rank #85 of 452 · https://www.anchorterminal.com/tools/langsmith.min.md
- Pick Braintrust API + MCP for nothing in particular. Pick LangSmith API + MCP for reliability (+20), agent ergonomics (+10), security & auth (+19), transparency & trust (+10).

| Category | Braintrust API + MCP | LangSmith API + MCP |
| --- | --- | --- |
| Reliability (16%) | 61 | 81 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 85 | 86 |
| Agent ergonomics (13%) | 66 | 76 |
| Security & auth (14%) | 58 | 77 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 85 |
| Transparency & trust (7%) | 68 | 78 |