# Braintrust

> Eval-first LLM platform that blocks bad prompts in CI

**Category:** AI Agents  
**Pricing:** freemium  
**URL:** https://braintrust.dev  
**Added:** 2026-08-19

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## The Hook

Braintrust blocks your merge when the prompt makes the model worse.

## What's Good

Braintrust is built around one loop: change a prompt, measure the result, ship the better one. The Eval() primitive runs experiments with real scorers—exact match, embedding similarity, LLM-as-judge factuality—and the CI integration blocks merges on statistically significant regressions.

## The Catch

Eval-first means observability is secondary—if your primary loop is debugging traces, look elsewhere. Learning curve to build eval datasets that actually represent production.

## Verdict

The platform for teams whose deployment loop is change-measure-ship.