The MiniMax Group booth at the World AI Conference in Shanghai, in July.Photographer: Qilai Shen/BloombergMiniMax Group Inc.’s revenue surged 283% in the first half of 2026, even as the Chinese AI upstart trailed rivals such as Z.AI Co. in releasing top-tier large language models.Revenue almost quadrupled to $116.6 million in the six months through June, compared with the 159% growth it posted for all of 2025. Analysts expect full-year sales to expand 360%....