Braintrust connects production traces, datasets, experiments, scorers, prompts, and human review, but judge validity, sensitive logs, retention, score volume, and release-gate design require calibration.
Direct verdict
Braintrust earns a shortlist for teams ready to operate evaluation as a product discipline. Start with one costly failure, calibrate scorers against humans and outcomes, minimize logged data, and version dataset and gate together.
What to verify
Freeze 300 cases and have two humans label 75. Compare three prompts and two models across deterministic checks, a model judge, human review, and task outcome. Measure agreement, bias, variance, false promotions, redaction, access, export, retention, and cost per decision.
Pricing
Freemium
Starter has a $0 platform fee with 1 GB processed data, 10,000 scores, and 14-day retention monthly, followed by usage rates. Pro is $249 monthly with 5 GB data, 50,000 scores, lower overage, and 30-day retention. Enterprise adds custom limits, security, and support. Reviewed September 1, 2026.
Free plan: Yes. Starter needs no card and includes limited data, scores, and retention before on-demand charges.