Show me the researchers and companies where the people in charge and the people doing the work don’t think it’s possible to get better than GPT-4 and are slow-r

Show me the researchers and companies where the people in charge and the people doing the work don’t think it’s possible to get better than GPT-4 and are slow-rolling things. I suppose maybe there are ones where they are slow-rolling because of their opinions about existential risk of AGI. But that’s not contingent on what OpenAI says or does.