Shares in Shanghai rose at the open on Wednesday as mainland investors returned from a week-long break to the start of a fresh China-US trade standoff and news of a new chatbot launched by mainland startup DeepSeek.

The Shanghai Composite Index climbed 0.6 percent to 3,270, while the Shenzhen Component Index opened 0.8 percent higher at 10,237. Hong Kong's Hang Seng Index rose 0.18 percent, to 20,827. (AFP)