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Comment by mjb

I wrote a slightly deeper blog post here: https://brooker.co.za/blog/2026/09/28/engineering-system-one...

On multiple tokens, we put each option (however many tokens it is) onto a line, and then read the hidden state at the end of that line to use at the option state. This is done option-by-option.

The hidden state at the end of the question is the query `q` (again, not sensitive to how many tokens the question is), each options end-of-line state is the key `k`, and the per-option logit is calculated as `q.k / sqrt(256)`.

parent mjb 25 days ago

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