Definition
Promptfoo is an open-source evaluation framework designed to systematically benchmark and regression-test LLM outputs, prompts, and RAG configurations through automated side-by-side comparisons. It allows developers to quantify performance using metrics like faithfulness and relevancy, though it introduces a trade-off between the speed of automated 'LLM-as-a-judge' evaluations and the higher precision (but lower scalability) of human-in-the-loop review.
An evaluation and testing harness, not a prompt library or a model provider.
"A Lab Technician's Centrifuge: spinning multiple variations of a formula simultaneously to see which one settles into the most stable and effective result."
- LLM-as-a-judge(Component)
- Evaluation Metric(Component)
- Regression Testing(Prerequisite)
- Faithfulness Score(Component)
Conceptual Overview
Promptfoo is an open-source evaluation framework designed to systematically benchmark and regression-test LLM outputs, prompts, and RAG configurations through automated side-by-side comparisons. It allows developers to quantify performance using metrics like faithfulness and relevancy, though it introduces a trade-off between the speed of automated 'LLM-as-a-judge' evaluations and the higher precision (but lower scalability) of human-in-the-loop review.
Disambiguation
An evaluation and testing harness, not a prompt library or a model provider.
Visual Analog
A Lab Technician's Centrifuge: spinning multiple variations of a formula simultaneously to see which one settles into the most stable and effective result.