I remember their capabilities like so:
GPT-3 could produce convincing looking texts, sometimes.
GPT-4 was somewhat smarter and would give more accurate answers. At that time image understanding was released, wasn't it?
Then with GPT-5 we have a reasoning model, another jump in capabilities.
Now, compare GPT-6 Astra with its ability to implement software, work on long horizon tasks, and visual understanding.