Arize Phoenix vs Galileo
Arize Phoenix vs Galileo: side-by-side comparison of two evaluation & observability platforms systems — architecture, taxonomy, license, pricing, MCP/A2A support, and direct edges.
Cost & capability
| Arize Phoenix | Galileo | |
|---|---|---|
| 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 Phoenix | Galileo | |
|---|---|---|
| Type | OSS LLM tracing + eval | Eval + observability + guardrails |
| Created | 2023 | 2021 |
| Latest release | v20.26.1 (2026-10-25) | v2.7.0 (2026-10-14) — galileo |
| License | Elastic-2.0 | proprietary; Python SDK Apache-2.0 |
| GitHub | Arize-ai/phoenix — ~12.0k stars, last commit 2026-10 | rungalileo/galileo-python — ~22 stars, last commit 2026-10 |
| Pricing | searched not found | Splunk Agent Observability from $100/mo per 1.2M spans billed annually (includes 500M Luna tokens); free edition available |
| Funding | searched not found | $45M Series B Oct-2024 (Scale Venture Partners led); acquired by Cisco (announced 2026-04-09, completed by 2026-05-22) |
| Deployment | searched not found | Both (self-hosted + managed cloud) — SaaS, VPC or on-premises |
| API surface | Python SDK, TypeScript SDK, REST API (OpenAPI), GraphQL API, CLI (phoenix-cli) | searched not found |
| MCP | yes — built-in remote MCP server at /mcp; legacy stdio @arizeai/phoenix-mcp in maintenance | yes — Agent Evals MCP server for IDEs such as Cursor and VS Code |
At a glance
| Arize Phoenix | Galileo | |
|---|---|---|
| Section | Evaluation & observability platforms | Evaluation & observability platforms |
| Tier | T1 | T1 |
| Type | OSS LLM tracing + eval | Eval + observability + guardrails |
| Created | 2023 | 2021 |
| Latest release | v20.26.1 (2026-10-25) | v2.7.0 (2026-10-14) — galileo |
| License | Elastic-2.0 | proprietary; Python SDK Apache-2.0 |
| GitHub | Arize-ai/phoenix — ~12.0k stars, last commit 2026-10 | rungalileo/galileo-python — ~22 stars, last commit 2026-10 |
| Pricing | searched not found | Splunk Agent Observability from $100/mo per 1.2M spans billed annually (includes 500M Luna tokens); free edition available |
| Funding | searched not found | $45M Series B Oct-2024 (Scale Venture Partners led); acquired by Cisco (announced 2026-04-09, completed by 2026-05-22) |
| Deployment | searched not found | Both (self-hosted + managed cloud) — SaaS, VPC or on-premises |
| API surface | Python SDK, TypeScript SDK, REST API (OpenAPI), GraphQL API, CLI (phoenix-cli) | searched not found |
| Multi-tenancy | searched not found | searched not found |
| MCP | yes — built-in remote MCP server at /mcp; legacy stdio @arizeai/phoenix-mcp in maintenance | yes — Agent Evals MCP server for IDEs such as Cursor and VS Code |
| 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 Phoenix
Pros: searched not found
Cons: searched not found
Galileo
Pros: searched not found
Cons: searched not found