GPT-6 sees only modest gains on empirical economics: researchers report the 'march of nines'
soumitrashukla9 · x · 2026-09-09
Economists are sharing first impressions of GPT-6. Chris Blattman calls it a step change but a tiny one — roughly the gap between 5.5 Codex and 5.5 ChatGPT Pro — occasionally worth using, but no dramatic improvement.
Yanagizawa reports similar results at Project APE: a key benchmark moved from 99% to 99.5%, the start of a "march of nines" where each additional nine signals a steep drop in error rate despite little visible jump.
Related event: Economists Find GPT-6 Upgrade Marginal and Barely Noticeable(2 posts)→
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