Compare · llm & agent observability
Arize vs Braintrust pricing
At 1M traces/month: Arize Contact sales, Braintrust $36.00.
| Arize | Braintrust | |
|---|---|---|
| Free tier | AX Free: 25K spans/month, 1 GB ingestion, 15-day retention. Phoenix OSS is free to self-host. | Starter: $0/mo, 1 GB processed data and 10K scores/month, unlimited users. |
| Billing unit (LLM & agent observability) | spans | GB |
| First paid plan | AX Pro: $50/mo | Pro: $249/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 | Braintrust |
|---|---|---|
| 100K | Contact sales | $0 Starter |
| 1M | Contact sales | $36.00 Starter |
| 10M | Contact sales | $396 Starter |
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 |
| Braintrust | |
|---|---|
| Starter | $0/mo 1 GB, then $4/GB; 10K scores, then $2.50/1K; $10 credits |
| Pro | $249/mo 5 GB, then $3/GB; 50K scores, then $1.50/1K; $100 credits |
| Enterprise | Contact sales |
Recent news
Sources
- Arize pricing page retrieved 2026-10-19
- Braintrust pricing page retrieved 2026-10-19