Why is the biggest name in AI late to the AI coding revolution?Photograph: MARK JAYSON QUINESSam Altman sits with his legs pretzeled in an office chair, staring deeply into the ceiling. To be fair, the new OpenAI headquarters—a temple of glass and blond wood in San Francisco’s Mission Bay—seems to invite this kind of contemplation. A kiosk behind reception holds booklets that describe the “Eras of AI” as if they were steps on the path to enlightenment. Posters along the stairs mark AI’s mileston...