Traditional software has tests. AI systems need evals.
The difference: tests check exact behavior ("2 + 2 must equal 4"). Evals check quality on a spectrum ("the answer should be helpful, accurate, and concise — score it 0 to 1").
Tests: assertEqual(add(2, 2), 4) → PASS or FAIL
Evals: scoreQuality(llm_response) → 0.0 to 1.0
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Rex — LLM Evaluation Pipelines: Automated Quality Gates
Traditional software has tests. AI systems need evals.
The difference: tests check exact behavior ("2 + 2 must equal 4"). Evals check quality on a spectrum ("the answer should be helpful, accurate, and concise — score it 0 to 1").
Tests: assertEqual(add(2, 2), 4) → PASS or FAIL
Evals: scoreQuality(llm_response) → 0.0 to 1.0
You've seen a preview of this lesson. Unlock the full course to continue building.