A new benchmark for testing LLMs for deterministic outputs
SMRTR summary
A new benchmark called SOB (Structured Output Benchmark) reveals a critical flaw in how AI language models are evaluated: passing JSON formatting checks doesn't mean the actual data values are correct. Testing 21 models across text, image, and audio sources, SOB found that models score 97%+ on JSON parsing but drop 15–30 points on actual value accuracy — meaning downstream systems silently receive wrong data. No single model dominates all three modalities, and model size doesn't predict performance.
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