Evals, a prompt playground and logging, with the results kept side by side. Built by Braintrust.
Others in evals and testing
DeepEvalTest what your LLM app says, and run every lesson with no API key.
OpenAI Evals
PromptfooTest your LLM app from the command line, with no API key.
RAGASGrade a RAG bot's answers and its retrieval, with no API key.Common questions
Is Braintrust free to use?
Braintrust is open source and free to run yourself. You still pay whichever model provider you point it at, and this tutorial is free with no signup.
Do I need to know Python to use Braintrust?
Basic Python is enough. Functions, dictionaries and imports cover most of what Braintrust asks of you.
When should I not use Braintrust?
When something else in evals and testing fits the job better. The others in that group are listed below.
Lessons for Braintrust are being written. Meanwhile the APIs for AI tutorial covers the same ground: state, tools, loops, memory and human approval. Most of it carries straight over.
Start the APIs for AI tutorial →