[China's AI Large Models Lead Weekly Usage for 21 Consecutive Weeks: DeepSeek V4.1-Flash Tops the Chart with a 219% Week-on-Week Growth] According to the latest data estimates from OpenRouter, the total global AI large model usage last week (September 14 to September 20) reached 129 trillion tokens, a week-on-week increase of 1.57%. Among the listed AI large models, China's AI large models recorded a weekly usage of 67.46 trillion tokens, a week-on-week growth of 10.28%, while U.S. AI large models saw a weekly usage of 14.21 trillion tokens, a week-on-week decline of 34.7%. China's large model weekly usage has surpassed that of the U.S. for 21 consecutive weeks, firmly holding the global top spot. Last week, four out of the top five global models by usage were Chinese AI large models. Among them, DeepSeek V4.1-Flash rose to first place with a weekly usage of 15.8 trillion tokens, marking a week-on-week growth of 219%.