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Braintrust in brief
Braintrust is the go-to for rigorous LLM application evaluation. Expensive, but essential for teams building AI products in production.
- Price249 €/month
- CategoryCode
- RecommendedYes
The essentials in 20 seconds
- Evaluation (evals), logging and prompt deployment platform for LLM applications
- Track prompt performance over time, detect regressions
- Python and TypeScript SDK integration
- Price: $249/month for teams
Verdict: Braintrust is the most mature LLM evals tool on the market. Essential if you're deploying serious AI applications.
What is Braintrust
Braintrust is a platform dedicated to LLM application evaluation. You instrument your app with their SDK, define test datasets and evaluation criteria, and Braintrust tells you how your prompts and models perform over time.
It's the tool that answers the question "is my AI application regressing when I switch models or prompts?"
Strengths
Systematic evals
Braintrust lets you build automated evaluation suites. You define your test cases, your scorers (LLM-as-judge, heuristics, code), and run evals on every prompt or model change.
Model comparison
You can test the same dataset across different LLMs and compare scores side by side. Informed decision-making on when to switch from GPT-4o to Claude Sonnet.
CI/CD integration
Evals can be run in CI via the SDK. If a prompt change causes a performance regression, CI fails before deployment.
Limits
High price
$249/month for the team plan. For a startup with a single LLM product, ROI depends on data volume and how critical the application is.
Learning curve on scorers
Defining good scorers is a skill in itself. LLM-as-judge scorers have their own biases. The platform gives you the tools but not the answers on how to evaluate properly.
Pricing
- Free: limited usage
- Team: $249/month
- Enterprise: custom quote
Alternatives
- LangSmith for observability and evals in the LangChain ecosystem
- Langfuse for a cheaper open source alternative
- PromptLayer for prompt logging and A/B testing
Verdict
Braintrust is the most complete platform for teams that take LLM application evaluation seriously. If you're pushing prompts to production without measuring their performance, Braintrust will show you just how risky that is.
FAQ
Does Braintrust replace LangSmith?
No, they complement each other. LangSmith is more focused on observability and debugging. Braintrust is more focused on rigorous evaluation and model comparison.
Can you use Braintrust with open source models?
Yes. Braintrust supports any LLM via its SDK.
Is evaluation data stored in Braintrust's cloud?
Yes by default. An on-premise option exists for enterprise.
Does Braintrust have a Python SDK?
Yes. Python and TypeScript are both supported with official SDKs.
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Screenshots Braintrust
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Braintrust : 0/10.
Braintrust is the go-to for rigorous LLM application evaluation. Expensive, but essential for teams building AI products in production..
Test Braintrust yourself
A free trial is available. Plan thirty minutes to form your own opinion.
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Braintrust
249 €/month