# Arize Phoenix vs Langfuse API + MCP (slim)

> Arize Phoenix has a score of 75.6 (BB) against Langfuse API + MCP's 72.8 (BB). Both do obs traces. The largest gap is payments & pricing, 20 points. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/arize-phoenix-vs-langfuse.md (~1,600 tokens) · this version ~330 tokens · JSON https://www.anchorterminal.com/compare/arize-phoenix-vs-langfuse.json · canonical https://www.anchorterminal.com/compare/arize-phoenix-vs-langfuse
- 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 Langfuse API + MCP's 72.8 (BB). Both do obs traces. The largest gap is payments & pricing, 20 points.

- Arize Phoenix: BB 75.6, rank #32 of 452 · https://www.anchorterminal.com/tools/arize-phoenix.min.md
- Langfuse API + MCP: BB 72.8, rank #66 of 452 · https://www.anchorterminal.com/tools/langfuse.min.md
- Pick Arize Phoenix for agent ergonomics (+16), payments & pricing (+20). Pick Langfuse API + MCP for schema & documentation (+5), security & auth (+9), transparency & trust (+11).

| Category | Arize Phoenix | Langfuse API + MCP |
| --- | --- | --- |
| Reliability (16%) | 77 | 80 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 88 | 93 |
| Agent ergonomics (13%) | 90 | 74 |
| Security & auth (14%) | 56 | 65 |
| Payments & pricing (10%) | 60 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 84 | 88 |
| Transparency & trust (7%) | 76 | 87 |