They're not coming from LLMs. They're coming from mRNA-based treatments and applying standard science to their basic principles.
And just to reinforce what djierardi said, you can't make successful new drugs and treatments for diseases just by thinking about it really hard. Practical tests are an absolute, unavoidable necessity—and not even just the final clinical tests; you have to be able to see how the molecules you're synthesizing interact with living tissue of various types, among other things, before you can even hope to test on humans.
Delegate that entirely to an LLM, and you'll end up giving clinical test subjects something that will melt their flesh, or coagulate their blood, or give them turbo-cancer. Because there is no comprehensive dataset that they can use to figure that stuff out purely by computation. We, as a civilization, simply do not yet understand biology and chemistry well enough to model it at that level.
So stop trying to figure out just how OpenAI and Anthropic are playing 12D chess and actually this situation is fantastic and will result in them saving the world. They're just greedy, selfish companies trying desperately not to be left standing when the music stops and all the chairs have disappeared.