ChatGPT was released to the public a year ago this month, kicking off a global frenzy around all things AI. Roughly 100 million people now use ChatGPT each week, the company said at the conference, and more than 90% of Fortune 500 businesses are building tools on OpenAI’s platform. But the ChatGPT maker is also confronting rival products from well-funded AI startups, tech giants and, most recently, Elon Musk, an early OpenAI backer.