Frontier models pick 7 every time: Astra 30/30

An Vo @an_vo12Originally posted 2026.10.16

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The bias seems even stronger in frontier models! GPT-6 Astra, Claude Opus 5.5, and Gemini 4 Argon all picked 7 in 30/30 times 🤯 But WHY exactly do LLMs love the number 7? 👀 It might have something to do with **SFT training data**! In our #EMNLP2026 paper (https://deepbias.github.io), we found that Olmo 3 7B picked a mix of numbers before SFT, BUT after SFT it picked 7 in 26/30 times. The SFT training data is full of examples where the answer is 7 👇

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