This photo taken on November 18, 2025 shows a household goods vendor using a calculator to tally up a customer's items at a market in Bangkok. Artificial intelligence may eventually call time on the humble plastic calculator, but Japan's Casio still sells tens of millions each year and even sees opportunities for expansion. Generative AI models are closing in on human mathematicians' skills -- achieving gold-level scores for the first time this year at a prestigious global competition. (Photo by Lillian SUWANRUMPHA / AFP via Getty Images) / To go with 'JAPAN-THAILAND-BUSINESS-TECHNOLOGY-AI-CALCULATORS' by Katie Forster and Watsamon Tri-Yasakda