OpenAI's Ted Sanders shares a rule of thumb for picking the right GPT-model Matthias Bastian View the LinkedIn Profile of Matthias Bastian Oct 27, 2026 OpenAI's Ted Sanders has categorized the new GPT-6.1 Terra and explained how the company names its language models. According to Sanders, model performance is multidimensional. A model that's great at math won't automatically be good at jokes. Still, most performance gaps come down to one variable: model si