Braintrust

Braintrust is a platform designed to help teams build reliable AI products through structured evaluation. It provides infrastructure for logging model interactions, running evaluations against test datasets, and tracking quality over time as prompts or models change. A particular strength is its experiment-first design: it makes it easy to run A/B comparisons between prompt variants or model versions and see the results side by side. For behavior architects, Braintrust reduces the overhead of systematic evaluation — rather than building custom scripts to run tests and compare results, teams can use purpose-built tooling that encourages a more disciplined, iterative approach to behavioral improvement.