Arize AX / Phoenix pricing (2026)
Answer: Arize AX / Phoenix lists a free plan (AX Free): 25k spans/mo; 1 GB/mo; 10 issues/mo; no card. Phoenix is open source. Paid entry is stated as $50/month. Billing model: Tiered by spans / GB. Last verified 2026-10-24 from the vendor’s own pricing page.
- Free tier: Yes — AX Free
- Free limits: 25k spans/mo; 1 GB/mo; 10 issues/mo; no card. Phoenix is open source
- Paid from: $50/month
- Last verified: 2026-10-24
- Source: https://arize.com/pricing/
Data table
| Field | Value (as recorded) |
|---|---|
| Free plan | AX Free |
| Free tier limits | 25k spans/mo; 1 GB/mo; 10 issues/mo; no card. Phoenix is open source |
| Paid from | $50/month |
| Pricing model | Tiered by spans / GB |
| Card required | No |
| OSS / self-host | Yes (Phoenix) |
| Last verified | 2026-10-24 |
| Source | Official pricing page ↗ |
Gotchas we recorded
None derived from the plan summary. Read the pricing page’s fine print.
Alternatives in LLM observability
Braintrust
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Laminar
Free tier $0/month
Langfuse
Free tier 50k units/mo; all platform features with limits; no card
LangSmith
Free tier $0/seat; up to 5k base traces/mo; 1 seat
Related
- Arize AX / Phoenix free tier page
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- LLM observability category
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Data: Arize AX / Phoenix pricing summary as of 2026-10-24. Source: O11y Watch (https://o11y-watch.pages.dev). License: CC BY 4.0. Please attribute "O11y Watch" with a link to https://o11y-watch.pages.dev/.
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