The gap between American and Chinese AI is closing fast. Chinese models narrowed the performance shortfall to a record-low 6% in June, down from 9% in May, according to Bloomberg Intelligence. The research arm said the shift raises real questions about how long US supremacy in AI will hold. The lead used to look comfortable. Over the previous 12 months, the gap averaged 10% to 15%, BI said. Then Zhipu AI’s GLM-5.2 reached the top of the global ranking in agentic coding, and the maths changed. It was not a solo act. Chinese models took two slots in LiveBench’s global…