Best AI LLM Evaluation Tools in 2026 · page 2

ARES

ARES is a free, open-source framework for evaluating retrieval-augmented generation systems, including custom RAG models and configuration comparisons.

OpenAI Evals

OpenAI Evals is an open-source platform for evaluating model outputs against style and content criteria you define.

OpenCompass

OpenCompass is a free, open-source platform for evaluating large language and multimodal models.

Pydantic Evals

Lighteval