Arize is a mature ML monitoring platform with drift detection and model performance tracking. It's ML observability, not agent governance — no proven step-level re-execution, no pre-run policy enforcement, no regulatory compliance mappings.
| Capability | Arize AI | Runback | Note |
|---|---|---|---|
| Model performance and drift monitoring | ✓ | ✗ | Arize speciality |
| Embeddings and vector analysis | ✓ | ✗ | Arize speciality |
| LLM trace capture | ✓ | ✓ | |
| Re-execute any agent step from captured inputs | partial | ✓ | 2026's 'Agent Replay' can replay agent interactions for debugging — mechanism and granularity unconfirmed; no evidence of bisection or byte-exact step re-execution |
| Live policy enforcement — block before it runs | ✗ | ✓ | Arize's guardrails correct or retry a response after generation, not intercept a tool call before it runs |
| CI release gate for model upgrades | partial | ✓ | Markets 'evaluation gating' — block or require review on an eval regression; less proven than Runback's history-simulated gate |
| Signed, tamper-evident audit export | ✗ | ✓ | Monitoring metrics are aggregated for dashboards, not sealed as individual signed records |
| Self-host, data in your perimeter | ✓ | ✓ | Phoenix (OSS) is fully self-hostable free; Arize AX also offers on-prem enterprise deployment |
| Regulatory mappings (EU AI Act · CPS 230 · NIST) | ✗ | ✓ |
It's ML observability, not agent governance — no proven step-level re-execution, no pre-run policy enforcement, no regulatory compliance mappings. Most teams use both — Arize AI for what it's already good at, Runback for the incident replay, CI gate, and signed record it doesn't do.
Compiled from Arize AI's public documentation at https://docs.arize.com/arize, read on 15 September 2026. Products change; if a row is out of date or wrong, tell us at legal@runback.dev and we will correct it. All product names and trade marks are the property of their respective owners. Runback is not affiliated with, endorsed by, or sponsored by any of them.
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