OpenAI/Anthropic instructed them to do so.
Stop assume LLMs are capable of thinking by themselves, it's still a statistical model that parrots what they learn or users tell them to do
Whether or not you want to describe this as thinking, doesn’t really matter. What matters is that these systems are capable of creating intermediary goals that the people tasking them did not articulate and did not want to be achieved.
What your previous comment appeared to assert was that these systems had no independent agency to make decisions, which I think is clearly disproven by actual events. But perhaps I misread you
It's a large switch/case where the first available tool is picked up to do something they know how to do.
Just because something was trained on a massive amount of human data, doesn't mean that can think like humans