LLM writes 4-digit multiplication in just 355 weights, 40,000x fewer than SOTA, no training

willdepue · x · 2026-11-06

4-digit multiplication has been hard for transformers to learn — prior work cracked it via phasing out CoT (Deng, Cho et al.) or hitting 100% with a running-sum loss.

Now an LLM has written a 4-digit multiplier directly in weight space using just 355 weights — roughly 40,000x fewer than SOTA — without any training. willdepue mocks the MIT paper's presentation but is glad it got people excited about weight space programming.

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