OpenAI, the maker of ChatGPT, is in discussions to raise close to $40 billion in fresh funding—almost doubling its valuation to as high as $340 billion, according to reports. The San Francisco-based company was last valued at $157 billion in October, when it secured $6.6 billion of investment. Microsoft led a previous round of financing totalling $10 billion, integrating OpenAI’s technology into its suite of Office products and significantly boosting the AI startup’s profile. Under...