Which evaluation metrics actually correlate with user satisfaction and business outcomes in production? Here's how we think about the five that matter most.

The Metrics That Matter

Five metrics consistently stand out as the strongest signals of production success:

Faithfulness -- Does the response accurately reflect the source material?

Relevance -- Does the response actually answer the user's question?

Completeness -- Does the response cover all aspects of the query?

Latency P95 -- Slow responses drive users to abandon

Toxicity -- Even rare toxic outputs destroy trust

Notably absent: BLEU score, perplexity, and several other academic metrics that don't translate well to production settings.

All five metrics are available as built-in scorers in EvalGuard. Run them on every deployment to catch regressions before your users do.

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