The benchmark gap, explained: What AI leaderboards measure and what they miss
Somewhere on the market, a mannequin changelog is promising “vital reasoning enhancements.” And elsewhere, an engineering crew is observing a manufacturing incident that the benchmark scores utterly missed. These two issues are associated. Every frontier mannequin now scores above 88% on MMLU. GPT-5.3 Codex sits at 93%. At that ceiling, rating variations between fashions are…
