OpenAI has closed a $40 billion funding round led by SoftBank, valuing the company at $300 billion.ChatGPT, OpenAI's flagship product, has 500 million weekly users and recently experienced spikes of 1 million new users in a single hour.OpenAI plans to release a new "open-weight" language model with reasoning capabilities and expects revenue to triple to $12.7 billion this year.The funding is connected to the Stargate Project, a $500 billion initiative with SoftBank, Oracle, and others to build AI data centers.