# Arize Phoenix vs Braintrust API + MCP (slim)

> Arize Phoenix has a score of 75.6 (BB) against Braintrust API + MCP's 61.3 (C). Both do obs traces. The largest gap is agent ergonomics, 24 points. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/arize-phoenix-vs-braintrust.md (~1,650 tokens) · this version ~330 tokens · JSON https://www.anchorterminal.com/compare/arize-phoenix-vs-braintrust.json · canonical https://www.anchorterminal.com/compare/arize-phoenix-vs-braintrust
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-05

Arize Phoenix has a score of 75.6 (BB) against Braintrust API + MCP's 61.3 (C). Both do obs traces. The largest gap is agent ergonomics, 24 points.

- Arize Phoenix: BB 75.6, rank #32 of 452 · https://www.anchorterminal.com/tools/arize-phoenix.min.md
- Braintrust API + MCP: C 61.3, rank #229 of 452 · https://www.anchorterminal.com/tools/braintrust.min.md
- Pick Arize Phoenix for reliability (+16), agent ergonomics (+24), payments & pricing (+20), transparency & trust (+8). Pick Braintrust API + MCP for nothing in particular.

| Category | Arize Phoenix | Braintrust API + MCP |
| --- | --- | --- |
| Reliability (16%) | 77 | 61 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 88 | 85 |
| Agent ergonomics (13%) | 90 | 66 |
| Security & auth (14%) | 56 | 58 |
| Payments & pricing (10%) | 60 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 84 | 85 |
| Transparency & trust (7%) | 76 | 68 |