"This also helps explain why the models had nothing to cause them to hold back. Those safety behaviors are added much later in the process."

I am a fan of Asimov and the three laws of Robotics. Itlooks like in OpenAI's world, the three Laws of Robotics would be added later if they were to develop the positronic brain. It may also explain how US Robotics from Asimov's books would have been able to design Robots that only partially adhered to the 3 laws (e.g. the robots in iRobot - the book - which were programmed to allow a human to come to harm through inaction so that the humans could complete their work on the plains of Mercury).