US artificial intelligence powerhouse OpenAI on Tuesday launched two open-source AI models, a move that is expected to challenge China’s dominance in the field. Sam Altman, co-founder and chief executive at the San Francisco-based firm, said in an X.com post that the two new open models, the GPT-OSS-120b and GPT-OSS-20b, were “a big deal”, adding that the company believed them to be “the best and most usable open models in the world”. The launch came as more Chinese open-source AI models –...