Being an agent isn't about how complex the model is, nor about how much RL is used. Bacteria is an agent. Sponges and Jellyfish are agents. It's about if the model engages in exploration and or generates inferences in service of non-trivial control problems.

> On the other hand, if you strap GPT-3 on an agent in a 3D Home Environment

GPT-3, just as any probability distribution, can inform an agent's actions but that doesn't make it one. WebGPT3 is an agent though.