Braintrust

Braintrust is an end-to-end platform for evaluating, observing, and iterating on LLM applications, combining evals, a prompt playground, tracing/observability, and datasets.

Category

LLM Observability

Pricing

Freemium, Subscription, Usage-based, Enterprise

Target Market

AI engineering teams, Startups, Enterprise

Founded

2023

Headquarters

San Francisco, USA

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  Evals & Experiments

  Run experiments against real datasets and score outputs with LLM judges, code, or humans.

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  Prompt Playground

  Compare prompts and models side by side and iterate on evaluations visually, no code required.

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  Observability & Tracing

  Inspect every trace and tool call, search millions of logs, and track latency, cost, and quality in real time.

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  Datasets

  Convert production traces into evaluation datasets and build regression tests from real failures.

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  Autoevals

  Library of prebuilt scorers (heuristic, statistical, and model-graded) for evaluating AI outputs.

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  Loop

  AI assistant that generates improved prompts, scorers, and datasets from a described optimization goal.

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  Pre-ship regression testing

  Evaluate prompt and model changes against datasets to catch regressions before deployment.

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  Production monitoring

  Trace live LLM app behavior and track quality, cost, and latency with online scoring.

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  Collaborative prompt iteration

  Use the playground to compare models and prompts and refine them as a team.

Free Starter tier requires no credit card and includes $10 credits. Pro is $249/month (with 6-12 months free for qualifying startups). Usage-based add-ons apply across tiers, e.g. processed data ($4/GB Starter, $3/GB Pro) and scores ($2.50 per 1,000 Starter, $1.50 per 1,000 Pro); Enterprise is custom.