OpenAI named the former president of Amazon Web Services’s Japan arm to spearhead its push to woo enterprise clients in the world’s fourth-largest economy.The artificial intelligence darling is opening an office in Tokyo as it releases a custom GPT-4 model catering to Japanese language users. OpenAI said it has 2 million weekly active users in the country, while its enterprise clients include Daikin Industries Ltd., Rakuten Group Inc. and an affiliate of Toyota Motor Corp....