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Wednesday, July 15, 2026 · about a 2 minute read

AI Doesn't Know What It Doesn't Know

A lot of today's research circles the same uncomfortable truth: these models are confident in ways they have not earned, and the gap between sounding right and being right is where the real work is happening.

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arXiv cs.CLModels
A Shared Subcircuit Lets LLMs Count Down Across Tasks

Researchers found that language models use a single shared internal circuit to count down, whether they are writing a sentence of a specific length, building a DNA sequence, or formatting a table. Think of it like a countdown timer built into the model, one timer, many uses. This matters because it shows these models are not just memorizing surface patterns. There is real structure under the hood, and understanding that structure is how we get better at predicting when the model will succeed and when it will quietly miscalculate.

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Want the slow, plain-English version of why this matters? This is exactly the kind of idea the book was written to unpack, one light-switch analogy at a time.JPWExplained properly in the book
arXiv cs.CLResearch
Scaling Point-in-Time Language Models

A team is building language models that are deliberately frozen in time, trained only on data available before a given date, so that financial and social-science researchers can backtest ideas without the model cheating by knowing how things turned out. It is a small idea with wide implications for anyone who wants to use AI to study the past honestly.

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Just Predicting Words book cover

The book behind this newsletter

Just Predicting Words

How ChatGPT, Claude, and Modern AI Actually Work

The trick is small. The world it built is not.

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