Compare · llm & agent observability
Arize vs Opik (Comet) pricing
At 1M traces/month: Arize Contact sales, Opik (Comet) $264.
| Arize | Opik (Comet) | |
|---|---|---|
| Free tier | AX Free: 25K spans/month, 1 GB ingestion, 15-day retention. Phoenix OSS is free to self-host. | Free Cloud: 25K spans/month, up to 10 team members, 60-day retention. Open source: unlimited, self-hosted. |
| Billing unit (LLM & agent observability) | spans | spans |
| First paid plan | AX Pro: $50/mo | Pro Cloud: $19/mo |
| Pricing data | Partially published | Published pricing |
| Company status | Acquired | Active |
| Open source / self-host | Yes / Yes | Yes / Yes |
| Last checked | 2026-10-19 | 2026-10-19 |
LLM & agent observability: estimated monthly cost
| traces / month | Arize | Opik (Comet) |
|---|---|---|
| 100K | Contact sales | $39.00 Pro Cloud |
| 1M | Contact sales | $264 Pro Cloud |
| 10M | Contact sales | $2,514 Pro Cloud |
Estimate, check vendor page. Figures are list prices computed from publicly posted pricing on the "last checked" date. They exclude taxes, discounts, add-ons, seats and contract terms unless stated. Always confirm on the vendor's own pricing page.
Plans side by side
| Arize | |
|---|---|
| AX Free | $0 25K spans, 1 GB |
| AX Pro | $50/mo 50K spans, 10 GB, 30-day retention |
| AX Enterprise | Contact sales |
| Opik (Comet) | |
|---|---|
| Open Source | $0 Self-host |
| Free Cloud | $0 25K spans/mo |
| Pro Cloud | $19/mo 100K spans, then $5/100K spans; extra retention $29/100K spans |
| Enterprise | Contact sales |
Recent news
Sources
- Arize pricing page retrieved 2026-10-19
- Comet/Opik pricing page retrieved 2026-10-19