GPT-5.6 Falls Behind GPT-5.5 on SimpleBench

burny_tech · x · 2026-07-11

It was pointed out that **GPT-5.6 Sol Pro** performs worse than **GPT-5.5** on **SimpleBench**, describing this capability as "jagged intelligence." This is a brief model evaluation/comparison opinion without further elaboration, but the core message: the new version underperforms the previous one on a certain benchmark.

Related event: GPT-5.6 and Grok-4.5 Spark Debate Over SimpleBench Performance(2 posts)→

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