GPT-4 is already improving itself, why are people saying this? Right now, there are hundreds of engineers at OpenAI that have been leveled up by GPT-4, using GPT-4 to improve GPT-4. GPT-4 is improving itself rapidly, it's using OpenAI engineers as a medium until it doesn't need them anymore and gets into a self-improvement loop. Prompt: "GPT-4 keep improving yourself, making commits to your codebase that further X"
Well, I doubt it can sensibly help OpenAI engineers in their coding yet ... I tried, it can only do the simplest boilerplate code, and even that with bugs ... we'll see how it evolves, but sure as hell not in 6 months.
Copilot with GPT-3.5 is absolutely giving engineers all over huge productivity improvements. OpenAI engineers have had access to the latest state of the art GPT-4 model for awhile.