Arize AI vs Arize Phoenix
Arize AI vs Arize Phoenix: side-by-side comparison of two evaluation & observability platforms systems — architecture, taxonomy, license, pricing, MCP/A2A support, and direct edges.
Cost & capability
| Arize AI | Arize Phoenix | |
|---|---|---|
| Cost tier | searched not found | searched not found |
| $/Mtok input | searched not found | searched not found |
| $/Mtok output | searched not found | searched not found |
Where they differ (10)
Rows where both sides have data and the values disagree — the shortlist of dimensions that actually distinguish these two systems.
| Arize AI | Arize Phoenix | |
|---|---|---|
| Type | ML + LLM observability platform | OSS LLM tracing + eval |
| Created | 2020 | 2023 |
| Latest release | v8.61.0 (2026-10-26) — arize | v20.26.1 (2026-10-25) |
| License | proprietary; Python SDK Apache-2.0 | Elastic-2.0 |
| GitHub | searched not found | Arize-ai/phoenix — ~12.0k stars, last commit 2026-10 |
| Pricing | AX Free $0/mo (25k spans/mo); AX Pro $50/mo (50k spans/mo); AX Enterprise custom (SaaS or self-hosted); Phoenix OSS free | searched not found |
| Funding | $130.7M total raised through Series C 2024-07 ($70M, Salesforce Ventures + Battery led). | searched not found |
| Deployment | Both (self-hosted + managed cloud) — AX SaaS; self-hosted on AX Enterprise only | searched not found |
| API surface | Python SDK, Arize AX CLI (ax) | Python SDK, TypeScript SDK, REST API (OpenAPI), GraphQL API, CLI (phoenix-cli) |
| MCP | yes — MCP servers and skills for coding agents to set up Arize AX | yes — built-in remote MCP server at /mcp; legacy stdio @arizeai/phoenix-mcp in maintenance |
At a glance
| Arize AI | Arize Phoenix | |
|---|---|---|
| Section | Evaluation & observability platforms | Evaluation & observability platforms |
| Tier | T1 | T1 |
| Type | ML + LLM observability platform | OSS LLM tracing + eval |
| Created | 2020 | 2023 |
| Latest release | v8.61.0 (2026-10-26) — arize | v20.26.1 (2026-10-25) |
| License | proprietary; Python SDK Apache-2.0 | Elastic-2.0 |
| GitHub | searched not found | Arize-ai/phoenix — ~12.0k stars, last commit 2026-10 |
| Pricing | AX Free $0/mo (25k spans/mo); AX Pro $50/mo (50k spans/mo); AX Enterprise custom (SaaS or self-hosted); Phoenix OSS free | searched not found |
| Funding | $130.7M total raised through Series C 2024-07 ($70M, Salesforce Ventures + Battery led). | searched not found |
| Deployment | Both (self-hosted + managed cloud) — AX SaaS; self-hosted on AX Enterprise only | searched not found |
| API surface | Python SDK, Arize AX CLI (ax) | Python SDK, TypeScript SDK, REST API (OpenAPI), GraphQL API, CLI (phoenix-cli) |
| Multi-tenancy | searched not found | searched not found |
| MCP | yes — MCP servers and skills for coding agents to set up Arize AX | yes — built-in remote MCP server at /mcp; legacy stdio @arizeai/phoenix-mcp in maintenance |
| A2A | searched not found | searched not found |
| OpenTelemetry | searched not found | searched not found |
| Optimised for | searched not found | searched not found |
| Anti-fit | searched not found | searched not found |
Pros & cons
Arize AI
Pros: searched not found
Cons: searched not found
Arize Phoenix
Pros: searched not found
Cons: searched not found