Arize Phoenix pricing
How Arize Phoenix charges, what to know before you commit, and what you'd pay at your usage — next to what the alternatives would cost for the same thing.
How it charges
Checked 2026-10-03 on arize.com ↗ · USD, list pricesIn short
Arize AX is free for 25k spans a month and $50 per month for 50k spans on Pro; Phoenix is free to self-host.
- Free plan
- Yes
- Cheapest paid plan
- $50/mo
- Side project
- $0/mo AX Free
- Growing
- over plan limits
- Scaling
- over plan limits
What the model leaves out
Arize prices by spans (treated as traces here; a trace usually has several spans). The page lists no overage price, so each plan is modeled as capped at its included spans; above 50k spans/month is Enterprise (custom pricing). Ingestion is also limited (1 GB Free, 10 GB Pro). Phoenix itself is open source and free to self-host (hosting costs are yours).
Before you commit
- Arize counts spans, not traces.
- Ingestion volume is capped too (1 GB on Free, 10 GB on Pro), and no overage price is listed above Pro; the next step is Enterprise.
- Retention is 15 days on Free and 30 days on Pro.
| Plan | Monthly fee | Traces per month |
|---|---|---|
| AX Free | Free | 25k traces includedup to 25k traces |
| AX Pro | $50/mo | 50k traces includedup to 50k traces |
What you'd pay
Over every plan's limits—/moThe same usage elsewhere
Cost as you grow
All LLM observability & evals pricing, compared →Which one fits your situation →