> So the cat is out of the bag, other companies know how to build ChatGPT-4 equivalent models?

Yup. If a french company, Mistral, can do it you know the cat is out of the bag (ok, ok, started by an ex- OpenAI person I think).

I tried mistral-next and it is impressive.

The "moat" at this point seems to be: "Invest and train models using $$$ of hardware and electricity".

It's both exciting (nobody has an edge) and depressing (the edge consist in buying billions worth of NVidia AI chips).