OpenAI's Ted Sanders shares a rule of thumb for picking the right GPT-model

OpenAI's Ted Sanders explains where GPT-6.1 Terra fits in the company's GPT lineup. The smaller model outperforms the larger Astra in technical communication and costs far less but trails it in most other areas. Sanders says model size, reasoning effort, and multi-agent systems are distinct dimensions that can’t be reduced to a single "IQ score."