LLM Evals - testing for applications using LLMs

Elizabet Oliveira

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Learn how to test applications built on Large Language Models (LLMs) using Vercel's AI SDK and Vitest. This guide focuses on creating Evals—special tests for evaluating LLM performance—to ensure the Xata Agent works well after prompt modifications or model changes. The post details setting up the testing environment, organizing output files, and converting results to human-readable formats. A custom UI for debugging test runs is also discussed.

Writing an LLM Eval with Vercel's AI SDK and Vitest