Braintrust Cost Calculator
Enter requests per month, average KB per trace, scores per month and retention days, then pick Starter or Pro. The calculator converts traces to GB processed and returns data, scores and retention charges, plan base and monthly total. Model credits are shown as a note and only subtracted if you opt in. Estimates only; braintrust.dev/pricing prevails.
Math runs in your browser. Nothing is uploaded.
Monthly total
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Per 1k requests
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Breakdown
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Formula: GB processed = requests × KB ÷ 1,000,000. Starter $0: 1 GB then $4/GB, 10k scores then $2.50 per 1k, 14-day retention, $10 model credits. Pro $249/mo: 5 GB then $3/GB, 50k scores then $1.50 per 1k, 30-day retention then $0.50/GB/month up to 180 days (steady state ≈ GB × $0.50 × (days − 30) ÷ 30), $100 model credits. Model credits are not part of the observability bill unless ticked. Enterprise is custom (not computed).
Estimates only. Official list prices as of 2026-11-02 (Asia/Shanghai); the provider's pricing page prevails. Sources: Braintrust pricing
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How it works
- How does Braintrust pricing work?
- Braintrust bills by data processed (GB of traces and logs), by scores and by extended retention. Starter is $0/month with 1 GB and 10k scores included; Pro is $249/month with 5 GB and 50k scores included.
- What are the overage rates?
- Starter: $4 per GB after 1 GB and $2.50 per 1k scores after 10k. Pro: $3 per GB after 5 GB and $1.50 per 1k scores after 50k.
- How is retention billed?
- Starter keeps data 14 days. Pro includes 30 days; retention beyond that costs $0.50 per GB per month, up to 180 days. The calculator approximates extended retention as GB processed × $0.50 × (days − 30) ÷ 30 at steady state.
- Are model credits subtracted?
- Starter includes $10 and Pro $100 of model credits for playground/LLM calls. They are not part of the observability bill, so they are only subtracted if you tick the option.
- How do I estimate KB per trace?
- Export a sample of traces and divide total size by count. Short chat turns are often 2–10 KB; agent traces with tool output and long contexts can be 50–500 KB. GB = requests × KB ÷ 1,000,000.