I wouldn't trust current models to do any real work. Aaand I think humans will be cheaper than LLMs for a long time to come. Ultimately all costs are labor and if you need to give the power plant people (running the plant, mining the fuel, building the plant) sandwiches to get them to provide power for your llm, you're probably better off giving a human programmer sandwiches instead.
The ai bubble pops when investors decide they want dividends instead of speculative gains.