OpenAI is retooling its leadership ahead of an expected IPO as Greg Brockman goes into "founder mode."

Brad Lightcap leaves OpenAI amid IPO plans, joining other executive departures; hints at new AI-related ventures in his farewell message.

The former operating chief is starting a new venture following several departures across leadership and safety teams at OpenAI.

Executives keep leaving OpenAI. What's going on?