Brad Lightcap, OpenAI's COO from 2021-ish through April 2026, is out after eight years. He was moved to "special projects" in April, which at this point in the industry is HR's polite term for the decompression chamber, and now he's leaving to "start something new." Denise Dresser, the chief revenue officer, absorbed most of his duties back in April. The notable practitioner detail: Lightcap scaled the go-to-market org from roughly 50 people to over 700 in an 18-month stretch ending mid-2025, starting with GPT-4 and ChatGPT Enterprise in 2023, specifically to fight Anthropic for enterprise accounts. Whoever inherits that org inherits a 14x headcount expansion built to justify an $852 billion valuation ahead of an expected IPO. He's also the last of the Y Combinator-era confidantes around Altman, and the fifth senior departure in recent months (Simo, Peebles, Weil, Narayanan). When the mission success "feels within sight," it is traditional to exit before the mission is reached, in case it isn't. Open question: does a go-to-market machine built for 700 people survive an IPO roadshow with its architect gone, or does Dresser get to find out in real time?