Compare · llm & agent observability
Arize vs LangSmith pricing
At 1M traces/month: Arize Contact sales, LangSmith $4,989.
| Arize | LangSmith | |
|---|---|---|
| Free tier | AX Free: 25K spans/month, 1 GB ingestion, 15-day retention. Phoenix OSS is free to self-host. | Developer: $0, 1 seat, 5K base traces/month, then pay-as-you-go. |
| Billing unit (LLM & agent observability) | spans | traces |
| First paid plan | AX Pro: $50/mo | Plus: $39 / seat / mo |
| Pricing data | Partially published | Published pricing |
| Company status | Acquired | Active |
| Open source / self-host | Yes / Yes | No / No |
| Last checked | 2026-10-19 | 2026-10-19 |
LLM & agent observability: estimated monthly cost
| traces / month | Arize | LangSmith |
|---|---|---|
| 100K | Contact sales | $489 Plus (1 seat) |
| 1M | Contact sales | $4,989 Plus (1 seat) |
| 10M | Contact sales | $49,989 Plus (1 seat) |
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 |
| LangSmith | |
|---|---|
| Developer | $0 / seat Max 1 seat, 5K base traces/mo |
| Plus | $39 / seat / mo 10K traces included, then 0.005 LSU ($0.005) per additional base trace |
| Enterprise | Contact sales |
Recent news
Sources
- Arize pricing page retrieved 2026-10-19
- LangSmith pricing page retrieved 2026-10-19