Before it
Scaling laws described smooth, predictable improvement in loss.
The problem
Some abilities appeared absent at small scale and present at large scale, which smooth curves do not explain.
What it introduced
A catalogue of tasks where performance jumps sharply past a scale threshold, framed as emergence.
Why it matters
It shaped how the field talked about capability and risk for two years, and provoked a serious rebuttal in 2023.
What modern models inherit
An unresolved argument about whether capability arrives smoothly or in steps.
What came next
Schaeffer's mirage paper argued the jumps come from discontinuous metrics, not the models.