What a 20x20-digit multiplication actually looks like by hand, per one LLM eval author
maksym_andr · x · 2026-09-17
maksymandr shared a photo of a full 20x20-digit long multiplication, showing the roughly twenty rows of partial products that make hand calculation nearly error-prone.
Context from his eval: GPT-6-Astra can't run without CoT and scores 99.6% at the lowest effort setting, while Claude Opus 5 gets 1200/1200 correct at max reasoning.
Related event: Frontier LLMs Nail 20-Digit Multiplication Without Tools(9 posts)→
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