Asian shares mostly gained as benchmarks in Tokyo and Seoul were lifted by buying of AI-related stocks.

South Korea’s Kospi briefly gained more than 4% and closed 3.1% higher, at 5,638.34. Computer chipmaker SK Hynix rallied 5.2% and Samsung Electronics gained 4.2%.

SK Hynix is set to release its third-quarter earnings Wednesday, a day before rival Samsung Electronics reports its results. Samsung has estimated its operating profit for the last quarter will be up nearly eight-fold from a year earlier.

Strong global demand for semiconductors is driving strong growth, and the South Korean economy expanded at a better-than-expected 3.4% annual rate in July-September, according to data released Tuesday.

Tokyo’s Nikkei 225 added 1.7% to 63,268.37. Testing equipment maker Advantest jumped 9.6% and OpenAI investor SoftBank Group climbed 5%.

Hong Kong’s Hang Seng gave up early gains, slipping 0.7% to 23,041.32, while the Shanghai Composite dropped 1.3% to 3,648.30.

Traders were watching for any major announcements from a closed-door meeting in Beijing of top leaders of China’s ruling Communist Party.

Taiwan’s Taiex rose 0.1%. India’s Sensex slipped 0.5%.