[Shanghai Composite Index Closes Down 0.2% at Midday, ChiNext Index Closes Down 1.29%] BlockBeats News, August 31: In the morning session of the A-share market today, the three major indices opened lower and then fluctuated upward, but retreated near the close. As of the midday close, the Shanghai Composite Index closed down 0.2%, the Shenzhen Component Index closed down 1%, and the ChiNext Index closed down 1.29%. The AI language model sector saw a volatile rise. The total half-day trading volume of the Shanghai and Shenzhen markets was approximately 1.31 trillion yuan, a decrease of about 112.1 billion yuan compared to the same period on the previous trading day.