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Ragas review 2026: the open-source (Apache 2.0) framework that pioneered the standard RAG-evaluation metrics — faithfulness, answer relevance, context precision and context recall — and remains the most widely adopted OSS RAG-eval reference. Python-native, reference-free LLM-as-a-judge scoring, eight core metrics and synthetic test-set generation. A focused metrics library (no UI or production monitoring), best used…

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