Looking back · deep dive, July 21, 2026

Whether export controls work is three questions

"Are export controls working?" is at least three questions: did they widen the compute gap, did they speed up China's self-sufficiency, and how much did they leak? The three use different yardsticks and can't refute each other. The research group Epoch AI estimates that the capability gap between Chinese and US models averages seven months, within a range of 4 to 14 months. Meanwhile, Beijing banned purchases of the chips made specially for China, and state projects exclude foreign accelerators. That amounts to Beijing giving up better products in the short term to build up its own supply chain.

Concept illustration split into two panels: on the left, a person in a black turtleneck sits on an office chair with hands on two side-by-side laptops whose screens show grey speech-bubble shapes, with a pen cup and a stack of boxes on the desk and a wall sign lettered "EPOCH AI" behind. On the right, a person wearing a lanyard badge hooks a rope between two black stanchion posts in front of a tall black cabinet with rows of slots and small lights, while a red-brown finned hardware card sits on a low table in front of the rope, with a pale pink circle behind the person.

The accurate version of "controls sped up China's self-sufficiency" is this: China's drive for self-sufficiency predates the controls, and the controls made it more urgent. China's national chip industry investment fund was set up in 2014 and the memory maker CXMT in 2016, both before the controls (deep dive, 2026-07-21). The single best leading indicator the deep dive named is CXMT's HBM3 yield and capacity expansion. What would prove its judgment wrong: the gap in Chinese model capability shrinks to under 4 months, or a Chinese frontier lab publicly completes full training of a flagship model on domestic chips. The deep dive set its own check-back deadline of July 2027. We didn't go back and check this round, so there's no result yet. When you hear "the controls failed" or "the controls worked," first ask which of the three questions the speaker means. How we checked →

Source and checks

This item ran in the brief of Oct 13, 2026, alongside 13 other items. How we checked it, the quote checks and what was still missing that day are on that issue's How we checked page.

Cite this item

SecondSource (2026). "Whether export controls work is three questions." https://secondsource.io/en/news/2026-10-13-6/. Accessed access date.